PLB32207S0370-2693(16)30439-710.1016/j.physletb.2016.08.019The Author(s)ExperimentsFig. 1Distribution of the number of b-tagged jets in preselected opposite-sign eμ events. The data are shown compared to the prediction from simulation, broken down into contributions from tt¯ (using the baseline Powheg+Pythia6 sample), Wt single top, Z+jets, dibosons, and events with fake electrons or muons, normalised to the same integrated luminosity as the data. The lower part of the figure shows the ratio of simulation to data, using various tt¯ signal samples, and the shaded band indicates the statistical uncertainty. The tt¯ contribution is normalised to the theoretical tt¯ cross-section prediction at s=13TeV of 832 pb.Fig. 1Fig. 2Distributions of (a) the number of jets, (b) the transverse momentum pT of the b-tagged jets, (c) the |η| of the electron, (d) the pT of the electron, (e) the |η| of the muon and (f) the pT of the muon, in events with an opposite-sign eμ pair and at least one b-tagged jet. The data are compared to the prediction from simulation, broken down into contributions from tt¯ (using the baseline Powheg+Pythia6 sample), single top, Z+jets, dibosons, and events with fake electrons or muons, normalised to the same number of entries as the data. The lower parts of the figures show the ratios of simulation to data, using various tt¯ signal samples, and with the shaded band indicating the statistical uncertainty. The last histogram bin includes the overflow.Fig. 2Fig. 3Distributions of electron and muon |η| and pT in same-sign eμ events with at least one b-tagged jet. The simulation prediction is normalised to the same integrated luminosity as the data, and broken down into contributions where both leptons are prompt, or one is a misidentified lepton from a photon conversion or heavy-flavour decay. In the pT distributions, the last bin includes the overflow.Fig. 3Fig. 4Cross-section for tt¯ pair production in pp collisions as a function of centre-of-mass energy. ATLAS results in the dilepton eμ channel at s=13, 8 and 7 TeV are compared to the NNLO+NNLL theoretical predictions.Fig. 4Table 1Summary of Monte Carlo samples used to model the signal and background processes. The ‘Calculation’ column corresponds to the order of the matrix element calculation in the Monte Carlo generator.Table 1ProcessGenerator + parton showerCalculationtt¯Powheg-Box v2+Pythia6NLOPowheg-Box v2+Herwig++Madgraph5_aMC@NLO+Herwig++Wt single topPowheg-Box v1+Pythia6NLOPowheg-Box v1+Herwig++Z+jetsSherpa 2.1.1NLO (up to two partons)DibosonSherpa 2.1.1NLO (up to two partons)Powheg+Pythia8NLOt-channel single topPowheg-Box v1+Pythia6NLOW+jetsPowheg-Box v2+Pythia8NLOtt¯+W/ZMadGraph+Pythia8LOTable 2Observed numbers of opposite-sign eμ events with one and two b-tagged jets (N1 and N2), together with the estimates of non-tt¯ backgrounds and associated systematic uncertainties. Uncertainties quoted as 0 are <0.5.Table 2Event countsN1N2Data119587069Single top1140±100221±68Diboson34±111±0Z(→ττ→eμ)+jets37±182±1Misidentified leptons164±65116±55Total background1370±120340±88Table 3The expected numbers of events with at least one misidentified lepton in the one- and two-b-tag opposite- and same-sign eμ samples, broken down into different categories as described in the text. For the same-sign samples, the contributions from wrong-sign (where the electron charge sign is misreconstructed) and right-sign prompt lepton events are also shown, and the total expected numbers of events are compared to the data. The uncertainties are due to simulation statistics, and numbers quoted as ‘0.0’ are smaller than 0.05.Table 3ComponentOS 1bSS 1bOS 2bSS 2bConversion e113±583±560±333.3±1.7Heavy-flavour e11.0±1.89.8±0.91.1±0.30.9±0.3Other e15±130.4±0.23.3±1.90.2±0.1Heavy-flavour μ9.5±0.95.6±0.71.9±0.40.5±0.2Other μ3.4±0.50.3±0.22.7±0.50.0±0.0Total misidentified151±1499±569±435±2Wrong-sign prompt–30.0±1.6–16.0±1.1Right-sign prompt–11.8±0.5–4.4±0.2Total–141±6–55±2Data–149–79Table 4Summary of the systematic uncertainties in ϵeμ, Geμ and Cb (with their relative signs where relevant), and the statistical, systematic, luminosity and beam energy uncertainties in the measured tt¯ cross-section σtt¯ at s=13 TeV. All uncertainties from the inclusive cross-section measurement apply to the fiducial measurement; in the lower part of the table only the systematic uncertainties that are different for the measurement of the fiducial cross-section σtt¯fid are given, together with the total analysis systematic uncertainties and total uncertainties in σtt¯fid. Uncertainties quoted as ‘0.0’ are smaller than 0.05%, whilst ‘–’ indicates that the corresponding uncertainty is not applicable.Table 4Uncertainty (inclusive σtt¯)Δϵeμ/ϵeμ [%]ΔCb/Cb [%]Δσtt¯/σtt¯ [%]Data statistics0.9tt¯ NLO modelling0.7−0.10.8tt¯ hadronisation−2.40.42.8Initial- and final-state radiation−0.30.10.4tt¯ heavy-flavour production–0.40.4Parton distribution functions0.5–0.5Single-top modelling––0.3Single-top/tt¯ interference––0.6Single-top Wt cross-section––0.5Diboson modelling––0.1Diboson cross-sections––0.0Z+jets extrapolation––0.2Electron energy scale/resolution0.20.00.2Electron identification0.30.00.3Electron isolation0.4–0.4Muon momentum scale/resolution−0.00.00.0Muon identification0.40.00.4Muon isolation0.2–0.3Lepton trigger0.10.00.2Jet energy scale0.30.10.3Jet energy resolution−0.10.00.2b-tagging–0.10.3Misidentified leptons––0.6Analysis systematics2.70.63.3Integrated luminosity––2.3LHC beam energy––1.5Total uncertainty2.70.64.4Uncertainty (fiducial σtt¯fid)ΔGeμ/Geμ [%]ΔCb/Cb [%]Δσtt¯fid/σtt¯fid [%]tt¯ NLO modelling0.5−0.10.6tt¯ hadronisation−1.60.41.9Parton distribution functions0.1–0.1Other uncertainties (as above)0.80.41.5Analysis systematics (σtt¯fid)1.80.62.5Total uncertainty (σtt¯fid)1.80.63.9Measurement of the tt¯ production cross-section using eμ events with b-tagged jets in pp collisions at s=13TeV with the ATLAS detectorThe ATLAS Collaboration⋆M.Aaboud136dG.Aad87B.Abbott114J.Abdallah65O.Abdinov12B.Abeloos118R.Aben108O.S.AbouZeid138N.L.Abraham150H.Abramowicz154H.Abreu153R.Abreu117Y.Abulaiti147a147bB.S.Acharya164a164b1L.Adamczyk40aD.L.Adams27J.Adelman109S.Adomeit101T.Adye132A.A.Affolder76T.Agatonovic-Jovin14J.Agricola56J.A.Aguilar-Saavedra127a127fS.P.Ahlen24F.Ahmadov672G.Aielli134a134bH.Akerstedt147a147bT.P.A.Åkesson83A.V.Akimov97G.L.Alberghi22a22bJ.Albert169S.Albrand57M.J.Alconada Verzini73M.Aleksa32I.N.Aleksandrov67C.Alexa28bG.Alexander154T.Alexopoulos10M.Alhroob114B.Ali129M.Aliev75a75bG.Alimonti93aJ.Alison33S.P.Alkire37B.M.M.Allbrooke150B.W.Allen117P.P.Allport19A.Aloisio105a105bA.Alonso38F.Alonso73C.Alpigiani139M.Alstaty87B.Alvarez Gonzalez32D.Álvarez Piqueras167M.G.Alviggi105a105bB.T.Amadio16K.Amako68Y.Amaral Coutinho26aC.Amelung25D.Amidei91S.P.Amor Dos Santos127a127cA.Amorim127a127bS.Amoroso32G.Amundsen25C.Anastopoulos140L.S.Ancu51N.Andari109T.Andeen11C.F.Anders60bG.Anders32J.K.Anders76K.J.Anderson33A.Andreazza93a93bV.Andrei60aS.Angelidakis9I.Angelozzi108P.Anger46A.Angerami37F.Anghinolfi32A.V.Anisenkov1103N.Anjos13A.Annovi125a125bC.Antel60aM.Antonelli49A.Antonov99⁎F.Anulli133aM.Aoki68L.Aperio Bella19G.Arabidze92Y.Arai68J.P.Araque127aA.T.H.Arce47F.A.Arduh73J-F.Arguin96S.Argyropoulos65M.Arik20aA.J.Armbruster144L.J.Armitage78O.Arnaez32H.Arnold50M.Arratia30O.Arslan23A.Artamonov98G.Artoni121S.Artz85S.Asai156N.Asbah44A.Ashkenazi154B.Åsman147a147bL.Asquith150K.Assamagan27R.Astalos145aM.Atkinson166N.B.Atlay142K.Augsten129G.Avolio32B.Axen16M.K.Ayoub118G.Azuelos964M.A.Baak32A.E.Baas60aM.J.Baca19H.Bachacou137K.Bachas75a75bM.Backes32M.Backhaus32P.Bagiacchi133a133bP.Bagnaia133a133bY.Bai35aJ.T.Baines132O.K.Baker176E.M.Baldin1103P.Balek130T.Balestri149F.Balli137W.K.Balunas123E.Banas41Sw.Banerjee1735A.A.E.Bannoura175L.Barak32E.L.Barberio90D.Barberis52a52bM.Barbero87T.Barillari102T.Barklow144N.Barlow30S.L.Barnes86B.M.Barnett132R.M.Barnett16Z.Barnovska5A.Baroncelli135aG.Barone25A.J.Barr121L.Barranco Navarro167F.Barreiro84J.Barreiro Guimarães da Costa35aR.Bartoldus144A.E.Barton74P.Bartos145aA.Basalaev124A.Bassalat118R.L.Bates55S.J.Batista159J.R.Batley30M.Battaglia138M.Bauce133a133bF.Bauer137H.S.Bawa1446J.B.Beacham112M.D.Beattie74T.Beau82P.H.Beauchemin162P.Bechtle23H.P.Beck187K.Becker121M.Becker85M.Beckingham170C.Becot111A.J.Beddall20eA.Beddall20bV.A.Bednyakov67M.Bedognetti108C.P.Bee149L.J.Beemster108T.A.Beermann32M.Begel27J.K.Behr44C.Belanger-Champagne89A.S.Bell80G.Bella154L.Bellagamba22aA.Bellerive31M.Bellomo88K.Belotskiy99O.Beltramello32N.L.Belyaev99O.Benary154D.Benchekroun136aM.Bender101K.Bendtz147a147bN.Benekos10Y.Benhammou154E.Benhar Noccioli176J.Benitez65D.P.Benjamin47J.R.Bensinger25S.Bentvelsen108L.Beresford121M.Beretta49D.Berge108E.Bergeaas Kuutmann165N.Berger5J.Beringer16S.Berlendis57N.R.Bernard88C.Bernius111F.U.Bernlochner23T.Berry79P.Berta130C.Bertella85G.Bertoli147a147bF.Bertolucci125a125bI.A.Bertram74C.Bertsche44D.Bertsche114G.J.Besjes38O.Bessidskaia Bylund147a147bM.Bessner44N.Besson137C.Betancourt50S.Bethke102A.J.Bevan78W.Bhimji16R.M.Bianchi126L.Bianchini25M.Bianco32O.Biebel101D.Biedermann17R.Bielski86N.V.Biesuz125a125bM.Biglietti135aJ.Bilbao De Mendizabal51H.Bilokon49M.Bindi56S.Binet118A.Bingul20bC.Bini133a133bS.Biondi22a22bD.M.Bjergaard47C.W.Black151J.E.Black144K.M.Black24D.Blackburn139R.E.Blair6J.-B.Blanchard137J.E.Blanco79T.Blazek145aI.Bloch44C.Blocker25W.Blum85⁎U.Blumenschein56S.Blunier34aG.J.Bobbink108V.S.Bobrovnikov1103S.S.Bocchetta83A.Bocci47C.Bock101M.Boehler50D.Boerner175J.A.Bogaerts32D.Bogavac14A.G.Bogdanchikov110C.Bohm147aV.Boisvert79P.Bokan14T.Bold40aA.S.Boldyrev164a164cM.Bomben82M.Bona78M.Boonekamp137A.Borisov131G.Borissov74J.Bortfeldt32D.Bortoletto121V.Bortolotto62a62b62cK.Bos108D.Boscherini22aM.Bosman13J.D.Bossio Sola29J.Boudreau126J.Bouffard2E.V.Bouhova-Thacker74D.Boumediene36C.Bourdarios118S.K.Boutle55A.Boveia32J.Boyd32I.R.Boyko67J.Bracinik19A.Brandt8G.Brandt56O.Brandt60aU.Bratzler157B.Brau88J.E.Brau117H.M.Braun175⁎W.D.Breaden Madden55K.Brendlinger123A.J.Brennan90L.Brenner108R.Brenner165S.Bressler172T.M.Bristow48D.Britton55D.Britzger44F.M.Brochu30I.Brock23R.Brock92G.Brooijmans37T.Brooks79W.K.Brooks34bJ.Brosamer16E.Brost117J.HBroughton19P.A.Bruckman de Renstrom41D.Bruncko145bR.Bruneliere50A.Bruni22aG.Bruni22aL.S.Bruni108BHBrunt30M.Bruschi22aN.Bruscino23P.Bryant33L.Bryngemark83T.Buanes15Q.Buat143P.Buchholz142A.G.Buckley55I.A.Budagov67F.Buehrer50M.K.Bugge120O.Bulekov99D.Bullock8H.Burckhart32S.Burdin76C.D.Burgard50B.Burghgrave109K.Burka41S.Burke132I.Burmeister45J.T.P.Burr121E.Busato36D.Büscher50V.Büscher85P.Bussey55J.M.Butler24C.M.Buttar55J.M.Butterworth80P.Butti108W.Buttinger27A.Buzatu55A.R.Buzykaev1103S.Cabrera 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Alberich167B.C.Cerio47A.S.Cerqueira26bA.Cerri150L.Cerrito78F.Cerutti16M.Cerv32A.Cervelli18S.A.Cetin20dA.Chafaq136aD.Chakraborty109S.K.Chan59Y.L.Chan62aP.Chang166J.D.Chapman30D.G.Charlton19A.Chatterjee51C.C.Chau159C.A.Chavez Barajas150S.Che112S.Cheatham74A.Chegwidden92S.Chekanov6S.V.Chekulaev160aG.A.Chelkov6710M.A.Chelstowska91C.Chen66H.Chen27K.Chen149S.Chen35cS.Chen156X.Chen35fY.Chen69H.C.Cheng91H.JCheng35aY.Cheng33A.Cheplakov67E.Cheremushkina131R.Cherkaoui El 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Castro22a22bS.De Cecco82N.De Groot107P.de Jong108H.De la Torre84F.De Lorenzi66A.De Maria56D.De Pedis133aA.De Salvo133aU.De Sanctis150A.De Santo150J.B.De Vivie De Regie118W.J.Dearnaley74R.Debbe27C.Debenedetti138D.V.Dedovich67N.Dehghanian3I.Deigaard108M.Del Gaudio39a39bJ.Del Peso84T.Del Prete125a125bD.Delgove118F.Deliot137C.M.Delitzsch51M.Deliyergiyev77A.Dell'Acqua32L.Dell'Asta24M.Dell'Orso125a125bM.Della Pietra105a11D.della Volpe51M.Delmastro5P.A.Delsart57D.A.DeMarco159S.Demers176M.Demichev67A.Demilly82S.P.Denisov131D.Denysiuk137D.Derendarz41J.E.Derkaoui136dF.Derue82P.Dervan76K.Desch23C.Deterre44K.Dette45P.O.Deviveiros32A.Dewhurst132S.Dhaliwal25A.Di Ciaccio134a134bL.Di Ciaccio5W.K.Di Clemente123C.Di Donato133a133bA.Di Girolamo32B.Di Girolamo32B.Di Micco135a135bR.Di Nardo32A.Di Simone50R.Di Sipio159D.Di Valentino31C.Diaconu87M.Diamond159F.A.Dias48M.A.Diaz34aE.B.Diehl91J.Dietrich17S.Diglio87A.Dimitrievska14J.Dingfelder23P.Dita28bS.Dita28bF.Dittus32F.Djama87T.Djobava53bJ.I.Djuvsland60aM.A.B.do Vale26cD.Dobos32M.Dobre28bC.Doglioni83T.Dohmae156J.Dolejsi130Z.Dolezal130B.A.Dolgoshein99⁎M.Donadelli26dS.Donati125a125bP.Dondero122a122bJ.Donini36J.Dopke132A.Doria105aM.T.Dova73A.T.Doyle55E.Drechsler56M.Dris10Y.Du35dJ.Duarte-Campderros154E.Duchovni172G.Duckeck101O.A.Ducu9613D.Duda108A.Dudarev32E.M.Duffield16L.Duflot118L.Duguid79M.Dührssen32M.Dumancic172M.Dunford60aH.Duran Yildiz4aM.Düren54A.Durglishvili53bD.Duschinger46B.Dutta44M.Dyndal44C.Eckardt44K.M.Ecker102R.C.Edgar91N.C.Edwards48T.Eifert32G.Eigen15K.Einsweiler16T.Ekelof165M.El 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Aranda13M.Pagáčová50S.Pagan Griso16F.Paige27P.Pais88K.Pajchel120G.Palacino160bS.Palazzo39a39bS.Palestini32M.Palka40bD.Pallin36A.Palma127a127bE.St.Panagiotopoulou10C.E.Pandini82J.G.Panduro Vazquez79P.Pani147a147bS.Panitkin27D.Pantea28bL.Paolozzi51Th.D.Papadopoulou10K.Papageorgiou155A.Paramonov6D.Paredes Hernandez176A.J.Parker74M.A.Parker30K.A.Parker140F.Parodi52a52bJ.A.Parsons37U.Parzefall50V.R.Pascuzzi159E.Pasqualucci133aS.Passaggio52aFr.Pastore79G.Pásztor3132S.Pataraia175J.R.Pater86T.Pauly32J.Pearce169B.Pearson114L.E.Pedersen38M.Pedersen120S.Pedraza Lopez167R.Pedro127a127bS.V.Peleganchuk1103D.Pelikan165O.Penc128C.Peng35aH.Peng35bJ.Penwell63B.S.Peralva26bM.M.Perego137D.V.Perepelitsa27E.Perez 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Perez13D.Rodriguez Rodriguez167S.Roe32C.S.Rogan59O.Røhne120A.Romaniouk99M.Romano22a22bS.M.Romano Saez36E.Romero Adam167N.Rompotis139M.Ronzani50L.Roos82E.Ros167S.Rosati133aK.Rosbach50P.Rose138O.Rosenthal142N.-A.Rosien56V.Rossetti147a147bE.Rossi105a105bL.P.Rossi52aJ.H.N.Rosten30R.Rosten139M.Rotaru28bI.Roth172J.Rothberg139D.Rousseau118C.R.Royon137A.Rozanov87Y.Rozen153X.Ruan146cF.Rubbo144M.S.Rudolph159F.Rühr50A.Ruiz-Martinez31Z.Rurikova50N.A.Rusakovich67A.Ruschke101H.L.Russell139J.P.Rutherfoord7N.Ruthmann32Y.F.Ryabov124M.Rybar166G.Rybkin118S.Ryu6A.Ryzhov131G.F.Rzehorz56A.F.Saavedra151G.Sabato108S.Sacerdoti29H.F-W.Sadrozinski138R.Sadykov67F.Safai Tehrani133aP.Saha109M.Sahinsoy60aM.Saimpert137T.Saito156H.Sakamoto156Y.Sakurai171G.Salamanna135a135bA.Salamon134a134bJ.E.Salazar Loyola34bD.Salek108P.H.Sales De Bruin139D.Salihagic102A.Salnikov144J.Salt167D.Salvatore39a39bF.Salvatore150A.Salvucci62aA.Salzburger32D.Sammel50D.Sampsonidis155A.Sanchez105a105bJ.Sánchez167V.Sanchez Martinez167H.Sandaker120R.L.Sandbach78H.G.Sander85M.Sandhoff175C.Sandoval21R.Sandstroem102D.P.C.Sankey132M.Sannino52a52bA.Sansoni49C.Santoni36R.Santonico134a134bH.Santos127aI.Santoyo Castillo150K.Sapp126A.Sapronov67J.G.Saraiva127a127dB.Sarrazin23O.Sasaki68Y.Sasaki156K.Sato161G.Sauvage5⁎E.Sauvan5G.Savage79P.Savard1594C.Sawyer132L.Sawyer8117J.Saxon33C.Sbarra22aA.Sbrizzi22a22bT.Scanlon80D.A.Scannicchio163M.Scarcella151V.Scarfone39a39bJ.Schaarschmidt172P.Schacht102B.M.Schachtner101D.Schaefer32R.Schaefer44J.Schaeffer85S.Schaepe23S.Schaetzel60bU.Schäfer85A.C.Schaffer118D.Schaile101R.D.Schamberger149V.Scharf60aV.A.Schegelsky124D.Scheirich130M.Schernau163C.Schiavi52a52bS.Schier138C.Schillo50M.Schioppa39a39bS.Schlenker32K.R.Schmidt-Sommerfeld102K.Schmieden32C.Schmitt85S.Schmitt44S.Schmitz85B.Schneider160aU.Schnoor50L.Schoeffel137A.Schoening60bB.D.Schoenrock92E.Schopf23M.Schott85J.Schovancova8S.Schramm51M.Schreyer174N.Schuh85M.J.Schultens23H.-C.Schultz-Coulon60aH.Schulz17M.Schumacher50B.A.Schumm138Ph.Schune137A.Schwartzman144T.A.Schwarz91Ph.Schwegler102H.Schweiger86Ph.Schwemling137R.Schwienhorst92J.Schwindling137T.Schwindt23G.Sciolla25F.Scuri125a125bF.Scutti90J.Searcy91P.Seema23S.C.Seidel106A.Seiden138F.Seifert129J.M.Seixas26aG.Sekhniaidze105aK.Sekhon91S.J.Sekula42D.M.Seliverstov124⁎N.Semprini-Cesari22a22bC.Serfon120L.Serin118L.Serkin164a164bM.Sessa135a135bR.Seuster169H.Severini114T.Sfiligoj77F.Sforza32A.Sfyrla51E.Shabalina56N.W.Shaikh147a147bL.Y.Shan35aR.Shang166J.T.Shank24M.Shapiro16P.B.Shatalov98K.Shaw164a164bS.M.Shaw86A.Shcherbakova147a147bC.Y.Shehu150P.Sherwood80L.Shi15236S.Shimizu69C.O.Shimmin163M.Shimojima103M.Shiyakova6737A.Shmeleva97D.Shoaleh Saadi96M.J.Shochet33S.Shojaii93a93bS.Shrestha112E.Shulga99M.A.Shupe7P.Sicho128A.M.Sickles166P.E.Sidebo148O.Sidiropoulou174D.Sidorov115A.Sidoti22a22bF.Siegert46Dj.Sijacki14J.Silva127a127dS.B.Silverstein147aV.Simak129O.Simard5Lj.Simic14S.Simion118E.Simioni85B.Simmons80D.Simon36M.Simon85P.Sinervo159N.B.Sinev117M.Sioli22a22bG.Siragusa174S.Yu.Sivoklokov100J.Sjölin147a147bM.B.Skinner74H.P.Skottowe59P.Skubic114M.Slater19T.Slavicek129M.Slawinska108K.Sliwa162R.Slovak130V.Smakhtin172B.H.Smart5L.Smestad15J.Smiesko145aS.Yu.Smirnov99Y.Smirnov99L.N.Smirnova10038O.Smirnova83M.N.K.Smith37R.W.Smith37M.Smizanska74K.Smolek129A.A.Snesarev97S.Snyder27R.Sobie16912F.Socher46A.Soffer154D.A.Soh152G.Sokhrannyi77C.A.Solans Sanchez32M.Solar129E.Yu.Soldatov99U.Soldevila167A.A.Solodkov131A.Soloshenko67O.V.Solovyanov131V.Solovyev124P.Sommer50H.Son162H.Y.Song35b39A.Sood16A.Sopczak129V.Sopko129V.Sorin13D.Sosa60bC.L.Sotiropoulou125a125bR.Soualah164a164cA.M.Soukharev1103D.South44B.C.Sowden79S.Spagnolo75a75bM.Spalla125a125bM.Spangenberg170F.Spanò79D.Sperlich17F.Spettel102R.Spighi22aG.Spigo32L.A.Spiller90M.Spousta130R.D.St. Denis55⁎A.Stabile93aR.Stamen60aS.Stamm17E.Stanecka41R.W.Stanek6C.Stanescu135aM.Stanescu-Bellu44M.M.Stanitzki44S.Stapnes120E.A.Starchenko131G.H.Stark33J.Stark57P.Staroba128P.Starovoitov60aS.Stärz32R.Staszewski41P.Steinberg27B.Stelzer143H.J.Stelzer32O.Stelzer-Chilton160aH.Stenzel54G.A.Stewart55J.A.Stillings23M.C.Stockton89M.Stoebe89G.Stoicea28bP.Stolte56S.Stonjek102A.R.Stradling8A.Straessner46M.E.Stramaglia18J.Strandberg148S.Strandberg147a147bA.Strandlie120M.Strauss114P.Strizenec145bR.Ströhmer174D.M.Strom117R.Stroynowski42A.Strubig107S.A.Stucci18B.Stugu15N.A.Styles44D.Su144J.Su126R.Subramaniam81S.Suchek60aY.Sugaya119M.Suk129V.V.Sulin97S.Sultansoy4cT.Sumida70S.Sun59X.Sun35aJ.E.Sundermann50K.Suruliz150G.Susinno39a39bM.R.Sutton150S.Suzuki68M.Svatos128M.Swiatlowski33I.Sykora145aT.Sykora130D.Ta50C.Taccini135a135bK.Tackmann44J.Taenzer159A.Taffard163R.Tafirout160aN.Taiblum154H.Takai27R.Takashima71T.Takeshita141Y.Takubo68M.Talby87A.A.Talyshev1103K.G.Tan90J.Tanaka156R.Tanaka118S.Tanaka68B.B.Tannenwald112S.Tapia Araya34bS.Tapprogge85S.Tarem153G.F.Tartarelli93aP.Tas130M.Tasevsky128T.Tashiro70E.Tassi39a39bA.Tavares Delgado127a127bY.Tayalati136dA.C.Taylor106G.N.Taylor90P.T.E.Taylor90W.Taylor160bF.A.Teischinger32P.Teixeira-Dias79K.K.Temming50D.Temple143H.Ten Kate32P.K.Teng152J.J.Teoh119F.Tepel175S.Terada68K.Terashi156J.Terron84S.Terzo102M.Testa49R.J.Teuscher15912T.Theveneaux-Pelzer87J.P.Thomas19J.Thomas-Wilsker79E.N.Thompson37P.D.Thompson19A.S.Thompson55L.A.Thomsen176E.Thomson123M.Thomson30M.J.Tibbetts16R.E.Ticse Torres87V.O.Tikhomirov9740Yu.A.Tikhonov1103S.Timoshenko99P.Tipton176S.Tisserant87K.Todome158T.Todorov5⁎S.Todorova-Nova130J.Tojo72S.Tokár145aK.Tokushuku68E.Tolley59L.Tomlinson86M.Tomoto104L.Tompkins14441K.Toms106B.Tong59E.Torrence117H.Torres143E.Torró Pastor139J.Toth8742F.Touchard87D.R.Tovey140T.Trefzger174A.Tricoli27I.M.Trigger160aS.Trincaz-Duvoid82M.F.Tripiana13W.Trischuk159B.Trocmé57A.Trofymov44C.Troncon93aM.Trottier-McDonald16M.Trovatelli169L.Truong164a164cM.Trzebinski41A.Trzupek41J.C-L.Tseng121P.V.Tsiareshka94G.Tsipolitis10N.Tsirintanis9S.Tsiskaridze13V.Tsiskaridze50E.G.Tskhadadze53aK.M.Tsui62aI.I.Tsukerman98V.Tsulaia16S.Tsuno68D.Tsybychev149A.Tudorache28bV.Tudorache28bA.N.Tuna59S.A.Tupputi22a22bS.Turchikhin10038D.Turecek129D.Turgeman172R.Turra93a93bA.J.Turvey42P.M.Tuts37M.Tyndel132G.Ucchielli22a22bI.Ueda156M.Ughetto147a147bF.Ukegawa161G.Unal32A.Undrus27G.Unel163F.C.Ungaro90Y.Unno68C.Unverdorben101J.Urban145bP.Urquijo90P.Urrejola85G.Usai8A.Usanova64L.Vacavant87V.Vacek129B.Vachon89C.Valderanis101E.Valdes Santurio147a147bN.Valencic108S.Valentinetti22a22bA.Valero167L.Valery13S.Valkar130S.Vallecorsa51J.A.Valls Ferrer167W.Van Den Wollenberg108P.C.Van Der Deijl108R.van der Geer108H.van der Graaf108N.van Eldik153P.van Gemmeren6J.Van Nieuwkoop143I.van Vulpen108M.C.van Woerden32M.Vanadia133a133bW.Vandelli32R.Vanguri123A.Vaniachine131P.Vankov108G.Vardanyan177R.Vari133aE.W.Varnes7T.Varol42D.Varouchas82A.Vartapetian8K.E.Varvell151J.G.Vasquez176F.Vazeille36T.Vazquez Schroeder89J.Veatch56L.M.Veloce159F.Veloso127a127cS.Veneziano133aA.Ventura75a75bM.Venturi169N.Venturi159A.Venturini25V.Vercesi122aM.Verducci133a133bW.Verkerke108J.C.Vermeulen108A.Vest4643M.C.Vetterli1434O.Viazlo83I.Vichou166⁎T.Vickey140O.E.Vickey Boeriu140G.H.A.Viehhauser121S.Viel16L.Vigani121R.Vigne64M.Villa22a22bM.Villaplana Perez93a93bE.Vilucchi49M.G.Vincter31V.B.Vinogradov67C.Vittori22a22bI.Vivarelli150S.Vlachos10M.Vlasak129M.Vogel175P.Vokac129G.Volpi125a125bM.Volpi90H.von der Schmitt102E.von Toerne23V.Vorobel130K.Vorobev99M.Vos167R.Voss32J.H.Vossebeld76N.Vranjes14M.Vranjes Milosavljevic14V.Vrba128M.Vreeswijk108R.Vuillermet32I.Vukotic33Z.Vykydal129P.Wagner23W.Wagner175H.Wahlberg73S.Wahrmund46J.Wakabayashi104J.Walder74R.Walker101W.Walkowiak142V.Wallangen147a147bC.Wang35cC.Wang35d87F.Wang173H.Wang16H.Wang42J.Wang44J.Wang151K.Wang89R.Wang6S.M.Wang152T.Wang23T.Wang37W.Wang35bX.Wang176C.Wanotayaroj117A.Warburton89C.P.Ward30D.R.Wardrope80A.Washbrook48P.M.Watkins19A.T.Watson19M.F.Watson19G.Watts139S.Watts86B.M.Waugh80S.Webb85M.S.Weber18S.W.Weber174J.S.Webster6A.R.Weidberg121B.Weinert63J.Weingarten56C.Weiser50H.Weits108P.S.Wells32T.Wenaus27T.Wengler32S.Wenig32N.Wermes23M.Werner50M.D.Werner66P.Werner32M.Wessels60aJ.Wetter162K.Whalen117N.L.Whallon139A.M.Wharton74A.White8M.J.White1R.White34bD.Whiteson163F.J.Wickens132W.Wiedenmann173M.Wielers132P.Wienemann23C.Wiglesworth38L.A.M.Wiik-Fuchs23A.Wildauer102F.Wilk86H.G.Wilkens32H.H.Williams123S.Williams108C.Willis92S.Willocq88J.A.Wilson19I.Wingerter-Seez5F.Winklmeier117O.J.Winston150B.T.Winter23M.Wittgen144J.Wittkowski101M.W.Wolter41H.Wolters127a127cS.D.Worm132B.K.Wosiek41J.Wotschack32M.J.Woudstra86K.W.Wozniak41M.Wu57M.Wu33S.L.Wu173X.Wu51Y.Wu91T.R.Wyatt86B.M.Wynne48S.Xella38D.Xu35aL.Xu27B.Yabsley151S.Yacoob146aR.Yakabe69D.Yamaguchi158Y.Yamaguchi119A.Yamamoto68S.Yamamoto156T.Yamanaka156K.Yamauchi104Y.Yamazaki69Z.Yan24H.Yang35eH.Yang173Y.Yang152Z.Yang15W-M.Yao16Y.C.Yap82Y.Yasu68E.Yatsenko5K.H.Yau Wong23J.Ye42S.Ye27I.Yeletskikh67A.L.Yen59E.Yildirim85K.Yorita171R.Yoshida6K.Yoshihara123C.Young144C.J.S.Young32S.Youssef24D.R.Yu16J.Yu8J.M.Yu91J.Yu66L.Yuan69S.P.Y.Yuen23I.Yusuff3044B.Zabinski41R.Zaidan35dA.M.Zaitsev13130N.Zakharchuk44J.Zalieckas15A.Zaman149S.Zambito59L.Zanello133a133bD.Zanzi90C.Zeitnitz175M.Zeman129A.Zemla40aJ.C.Zeng166Q.Zeng144K.Zengel25O.Zenin131T.Ženiš145aD.Zerwas118D.Zhang91F.Zhang173G.Zhang35b39H.Zhang35cJ.Zhang6L.Zhang50R.Zhang23R.Zhang35b45X.Zhang35dZ.Zhang118X.Zhao42Y.Zhao35dZ.Zhao35bA.Zhemchugov67J.Zhong121B.Zhou91C.Zhou47L.Zhou37L.Zhou42M.Zhou149N.Zhou35fC.G.Zhu35dH.Zhu35aJ.Zhu91Y.Zhu35bX.Zhuang35aK.Zhukov97A.Zibell174D.Zieminska63N.I.Zimine67C.Zimmermann85S.Zimmermann50Z.Zinonos56M.Zinser85M.Ziolkowski142L.Živković14G.Zobernig173A.Zoccoli22a22bM.zur Nedden17L.Zwalinski321Department of Physics, University of Adelaide, Adelaide, AustraliaDepartment of PhysicsUniversity of AdelaideAdelaideAustralia2Physics Department, SUNY Albany, Albany NY, United StatesPhysics DepartmentSUNY AlbanyAlbanyNYUnited States3Department of Physics, University of Alberta, Edmonton AB, CanadaDepartment of PhysicsUniversity of AlbertaEdmontonABCanada4aDepartment of Physics, Ankara University, Ankara, TurkeyDepartment of PhysicsAnkara UniversityAnkaraTurkey4bIstanbul Aydin University, Istanbul, TurkeyIstanbul Aydin UniversityIstanbulTurkey4cDivision of Physics, TOBB University of Economics and Technology, Ankara, TurkeyDivision of PhysicsTOBB University of Economics and TechnologyAnkaraTurkey5LAPP, CNRS/IN2P3 and Université Savoie Mont Blanc, Annecy-le-Vieux, FranceLAPPCNRS/IN2P3Université Savoie Mont BlancAnnecy-le-VieuxFrance6High Energy Physics Division, Argonne National Laboratory, Argonne IL, United StatesHigh Energy Physics DivisionArgonne National LaboratoryArgonneILUnited States7Department of Physics, University of Arizona, Tucson AZ, United StatesDepartment of PhysicsUniversity of ArizonaTucsonAZUnited States8Department of Physics, The University of Texas at Arlington, Arlington TX, United StatesDepartment of PhysicsThe University of Texas at ArlingtonArlingtonTXUnited States9Physics Department, University of Athens, Athens, GreecePhysics DepartmentUniversity of AthensAthensGreece10Physics Department, National Technical University of Athens, Zografou, GreecePhysics DepartmentNational Technical University of AthensZografouGreece11Department of Physics, The University of Texas at Austin, Austin TX, United StatesDepartment of PhysicsThe University of Texas at AustinAustinTXUnited States12Institute of Physics, Azerbaijan Academy of Sciences, Baku, AzerbaijanInstitute of PhysicsAzerbaijan Academy of SciencesBakuAzerbaijan13Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Barcelona, SpainInstitut de Física d'Altes Energies (IFAE)The Barcelona Institute of Science and TechnologyBarcelonaSpain14Institute of Physics, University of Belgrade, Belgrade, SerbiaInstitute of PhysicsUniversity of BelgradeBelgradeSerbia15Department for Physics and Technology, University of Bergen, Bergen, NorwayDepartment for Physics and TechnologyUniversity of BergenBergenNorway16Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley CA, United StatesPhysics DivisionLawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyCAUnited States17Department of Physics, Humboldt University, Berlin, GermanyDepartment of PhysicsHumboldt UniversityBerlinGermany18Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, SwitzerlandAlbert Einstein Center for Fundamental PhysicsLaboratory for High Energy PhysicsUniversity of BernBernSwitzerland19School of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and AstronomyUniversity of BirminghamBirminghamUnited Kingdom20aDepartment of Physics, Bogazici University, Istanbul, TurkeyDepartment of PhysicsBogazici UniversityIstanbulTurkey20bDepartment of Physics Engineering, Gaziantep University, Gaziantep, TurkeyDepartment of Physics EngineeringGaziantep UniversityGaziantepTurkey20dIstanbul Bilgi University, Faculty of Engineering and Natural Sciences, Istanbul, TurkeyIstanbul Bilgi UniversityFaculty of Engineering and Natural SciencesIstanbulTurkey20eBahcesehir University, Faculty of Engineering and Natural Sciences, Istanbul, TurkeyBahcesehir UniversityFaculty of Engineering and Natural SciencesIstanbulTurkey21Centro de Investigaciones, Universidad Antonio Narino, Bogota, ColombiaCentro de InvestigacionesUniversidad Antonio NarinoBogotaColombia22aINFN Sezione di Bologna, ItalyINFNSezione di BolognaItaly22bDipartimento di Fisica e Astronomia, Università di Bologna, Bologna, ItalyDipartimento di Fisica e AstronomiaUniversità di BolognaBolognaItaly23Physikalisches Institut, University of Bonn, Bonn, GermanyPhysikalisches InstitutUniversity of BonnBonnGermany24Department of Physics, Boston University, Boston MA, United StatesDepartment of PhysicsBoston UniversityBostonMAUnited States25Department of Physics, Brandeis University, Waltham MA, United StatesDepartment of PhysicsBrandeis UniversityWalthamMAUnited States26aUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilUniversidade Federal do Rio De Janeiro COPPE/EE/IFRio de JaneiroBrazil26bElectrical Circuits Department, Federal University of Juiz de Fora (UFJF), Juiz de Fora, BrazilElectrical Circuits DepartmentFederal University of Juiz de Fora (UFJF)Juiz de ForaBrazil26cFederal University of Sao Joao del Rei (UFSJ), Sao Joao del Rei, BrazilFederal University of Sao Joao del Rei (UFSJ)Sao Joao del ReiBrazil26dInstituto de Fisica, Universidade de Sao Paulo, Sao Paulo, BrazilInstituto de FisicaUniversidade de Sao PauloSao PauloBrazil27Physics Department, Brookhaven National Laboratory, Upton NY, United StatesPhysics DepartmentBrookhaven National LaboratoryUptonNYUnited States28aTransilvania University of Brasov, Brasov, RomaniaTransilvania University of BrasovBrasovRomania28bNational Institute of Physics and Nuclear Engineering, Bucharest, RomaniaNational Institute of Physics and Nuclear EngineeringBucharestRomania28cNational Institute for Research and Development of Isotopic and Molecular Technologies, Physics Department, Cluj Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular TechnologiesPhysics DepartmentCluj NapocaRomania28dUniversity Politehnica Bucharest, Bucharest, RomaniaUniversity Politehnica BucharestBucharestRomania28eWest University in Timisoara, Timisoara, RomaniaWest University in TimisoaraTimisoaraRomania29Departamento de Física, Universidad de Buenos Aires, Buenos Aires, ArgentinaDepartamento de FísicaUniversidad de Buenos AiresBuenos AiresArgentina30Cavendish Laboratory, University of Cambridge, Cambridge, United KingdomCavendish LaboratoryUniversity of CambridgeCambridgeUnited Kingdom31Department of Physics, Carleton University, Ottawa ON, CanadaDepartment of PhysicsCarleton UniversityOttawaONCanada32CERN, Geneva, SwitzerlandCERNGenevaSwitzerland33Enrico Fermi Institute, University of Chicago, Chicago IL, United StatesEnrico Fermi InstituteUniversity of ChicagoChicagoILUnited States34aDepartamento de Física, Pontificia Universidad Católica de Chile, Santiago, ChileDepartamento de FísicaPontificia Universidad Católica de ChileSantiagoChile34bDepartamento de Física, Universidad Técnica Federico Santa María, Valparaíso, ChileDepartamento de FísicaUniversidad Técnica Federico Santa MaríaValparaísoChile35aInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing, ChinaInstitute of High Energy PhysicsChinese Academy of SciencesBeijingChina35bDepartment of Modern Physics, University of Science and Technology of China, Anhui, ChinaDepartment of Modern PhysicsUniversity of Science and Technology of ChinaAnhuiChina35cDepartment of Physics, Nanjing University, Jiangsu, ChinaDepartment of PhysicsNanjing UniversityJiangsuChina35dSchool of Physics, Shandong University, Shandong, ChinaSchool of PhysicsShandong UniversityShandongChina35eDepartment of Physics and Astronomy, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai4646Also affiliated with PKU-CHEP., ChinaDepartment of Physics and AstronomyShanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityShanghaiChina35fPhysics Department, Tsinghua University, Beijing 100084, ChinaPhysics DepartmentTsinghua UniversityBeijing100084China36Laboratoire de Physique Corpusculaire, Clermont Université and Université Blaise Pascal and CNRS/IN2P3, Clermont-Ferrand, FranceLaboratoire de Physique CorpusculaireClermont UniversitéUniversité Blaise PascalCNRS/IN2P3Clermont-FerrandFrance37Nevis Laboratory, Columbia University, Irvington NY, United StatesNevis LaboratoryColumbia UniversityIrvingtonNYUnited States38Niels Bohr Institute, University of Copenhagen, Kobenhavn, DenmarkNiels Bohr InstituteUniversity of CopenhagenKobenhavnDenmark39aINFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, ItalyINFN Gruppo Collegato di CosenzaLaboratori Nazionali di FrascatiItaly39bDipartimento di Fisica, Università della Calabria, Rende, ItalyDipartimento di FisicaUniversità della CalabriaRendeItaly40aAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, PolandAGH University of Science and TechnologyFaculty of Physics and Applied Computer ScienceKrakowPoland40bMarian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, PolandMarian Smoluchowski Institute of PhysicsJagiellonian UniversityKrakowPoland41Institute of Nuclear Physics Polish Academy of Sciences, Krakow, PolandInstitute of Nuclear Physics Polish Academy of SciencesKrakowPoland42Physics Department, Southern Methodist University, Dallas TX, United StatesPhysics DepartmentSouthern Methodist UniversityDallasTXUnited States43Physics Department, University of Texas at Dallas, Richardson TX, United StatesPhysics DepartmentUniversity of Texas at DallasRichardsonTXUnited States44DESY, Hamburg and Zeuthen, GermanyDESYHamburg and ZeuthenGermany45Lehrstuhl für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, GermanyLehrstuhl für Experimentelle Physik IVTechnische Universität DortmundDortmundGermany46Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, GermanyInstitut für Kern- und TeilchenphysikTechnische Universität DresdenDresdenGermany47Department of Physics, Duke University, Durham NC, United StatesDepartment of PhysicsDuke UniversityDurhamNCUnited States48SUPA – School of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomSUPA – School of Physics and AstronomyUniversity of EdinburghEdinburghUnited Kingdom49INFN Laboratori Nazionali di Frascati, Frascati, ItalyINFN Laboratori Nazionali di FrascatiFrascatiItaly50Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, GermanyFakultät für Mathematik und PhysikAlbert-Ludwigs-UniversitätFreiburgGermany51Section de Physique, Université de Genève, Geneva, SwitzerlandSection de PhysiqueUniversité de GenèveGenevaSwitzerland52aINFN Sezione di Genova, ItalyINFN Sezione di GenovaItaly52bDipartimento di Fisica, Università di Genova, Genova, ItalyDipartimento di FisicaUniversità di GenovaGenovaItaly53aE. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, GeorgiaE. Andronikashvili Institute of PhysicsIv. Javakhishvili Tbilisi State UniversityTbilisiGeorgia53bHigh Energy Physics Institute, Tbilisi State University, Tbilisi, GeorgiaHigh Energy Physics InstituteTbilisi State UniversityTbilisiGeorgia54II Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, GermanyII Physikalisches InstitutJustus-Liebig-Universität GiessenGiessenGermany55SUPA – School of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSUPA – School of Physics and AstronomyUniversity of GlasgowGlasgowUnited Kingdom56II Physikalisches Institut, Georg-August-Universität, Göttingen, GermanyII Physikalisches InstitutGeorg-August-UniversitätGöttingenGermany57Laboratoire de Physique Subatomique et de Cosmologie, Université Grenoble-Alpes, CNRS/IN2P3, Grenoble, FranceLaboratoire de Physique Subatomique et de CosmologieUniversité Grenoble-AlpesCNRS/IN2P3GrenobleFrance58Department of Physics, Hampton University, Hampton VA, United StatesDepartment of PhysicsHampton UniversityHamptonVAUnited States59Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge MA, United StatesLaboratory for Particle Physics and CosmologyHarvard UniversityCambridgeMAUnited States60aKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyKirchhoff-Institut für PhysikRuprecht-Karls-Universität HeidelbergHeidelbergGermany60bPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyPhysikalisches InstitutRuprecht-Karls-Universität HeidelbergHeidelbergGermany60cZITI Institut für technische Informatik, Ruprecht-Karls-Universität Heidelberg, Mannheim, GermanyZITI Institut für technische InformatikRuprecht-Karls-Universität HeidelbergMannheimGermany61Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, JapanFaculty of Applied Information ScienceHiroshima Institute of TechnologyHiroshimaJapan62aDepartment of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong KongDepartment of PhysicsThe Chinese University of Hong KongShatinN.T.Hong Kong62bDepartment of Physics, The University of Hong Kong, Hong KongDepartment of PhysicsThe University of Hong KongHong Kong62cDepartment of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaDepartment of PhysicsThe Hong Kong University of Science and TechnologyClear Water Bay, KowloonHong Kong, China63Department of Physics, Indiana University, Bloomington IN, United StatesDepartment of PhysicsIndiana UniversityBloomingtonINUnited States64Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, AustriaInstitut für Astro- und TeilchenphysikLeopold-Franzens-UniversitätInnsbruckAustria65University of Iowa, Iowa City IA, United StatesUniversity of IowaIowa CityIAUnited States66Department of Physics and Astronomy, Iowa State University, Ames IA, United StatesDepartment of Physics and AstronomyIowa State UniversityAmesIAUnited States67Joint Institute for Nuclear Research, JINR Dubna, Dubna, RussiaJoint Institute for Nuclear ResearchJINR DubnaDubnaRussia68KEK, High Energy Accelerator Research Organization, Tsukuba, JapanKEKHigh Energy Accelerator Research OrganizationTsukubaJapan69Graduate School of Science, Kobe University, Kobe, JapanGraduate School of ScienceKobe UniversityKobeJapan70Faculty of Science, Kyoto University, Kyoto, JapanFaculty of ScienceKyoto UniversityKyotoJapan71Kyoto University of Education, Kyoto, JapanKyoto University of EducationKyotoJapan72Department of Physics, Kyushu University, Fukuoka, JapanDepartment of PhysicsKyushu UniversityFukuokaJapan73Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaInstituto de Física La PlataUniversidad Nacional de La Plata and CONICETLa PlataArgentina74Physics Department, Lancaster University, Lancaster, United KingdomPhysics DepartmentLancaster UniversityLancasterUnited Kingdom75aINFN Sezione di Lecce, ItalyINFN Sezione di LecceItaly75bDipartimento di Matematica e Fisica, Università del Salento, Lecce, ItalyDipartimento di Matematica e FisicaUniversità del SalentoLecceItaly76Oliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomOliver Lodge LaboratoryUniversity of LiverpoolLiverpoolUnited Kingdom77Department of Physics, Jožef Stefan Institute and University of Ljubljana, Ljubljana, SloveniaDepartment of PhysicsJožef Stefan InstituteUniversity of LjubljanaLjubljanaSlovenia78School of Physics and Astronomy, Queen Mary University of London, London, United KingdomSchool of Physics and AstronomyQueen Mary University of LondonLondonUnited Kingdom79Department of Physics, Royal Holloway University of London, Surrey, United KingdomDepartment of PhysicsRoyal Holloway University of LondonSurreyUnited Kingdom80Department of Physics and Astronomy, University College London, London, United KingdomDepartment of Physics and AstronomyUniversity College LondonLondonUnited Kingdom81Louisiana Tech University, Ruston LA, United StatesLouisiana Tech UniversityRustonLAUnited States82Laboratoire de Physique Nucléaire et de Hautes Energies, UPMC and Université Paris-Diderot and CNRS/IN2P3, Paris, FranceLaboratoire de Physique Nucléaire et de Hautes EnergiesUPMCUniversité Paris-DiderotCNRS/IN2P3ParisFrance83Fysiska institutionen, Lunds universitet, Lund, SwedenFysiska institutionenLunds universitetLundSweden84Departamento de Fisica Teorica C-15, Universidad Autonoma de Madrid, Madrid, SpainDepartamento de Fisica Teorica C-15Universidad Autonoma de MadridMadridSpain85Institut für Physik, Universität Mainz, Mainz, GermanyInstitut für PhysikUniversität MainzMainzGermany86School of Physics and Astronomy, University of Manchester, Manchester, United KingdomSchool of Physics and AstronomyUniversity of ManchesterManchesterUnited Kingdom87CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, FranceCPPMAix-Marseille UniversitéCNRS/IN2P3MarseilleFrance88Department of Physics, University of Massachusetts, Amherst MA, United StatesDepartment of PhysicsUniversity of MassachusettsAmherstMAUnited States89Department of Physics, McGill University, Montreal QC, CanadaDepartment of PhysicsMcGill UniversityMontrealQCCanada90School of Physics, University of Melbourne, Victoria, AustraliaSchool of PhysicsUniversity of MelbourneVictoriaAustralia91Department of Physics, The University of Michigan, Ann Arbor MI, United StatesDepartment of PhysicsThe University of MichiganAnn ArborMIUnited States92Department of Physics and Astronomy, Michigan State University, East Lansing MI, United StatesDepartment of Physics and AstronomyMichigan State UniversityEast LansingMIUnited States93aINFN Sezione di Milano, ItalyINFN Sezione di MilanoItaly93bDipartimento di Fisica, Università di Milano, Milano, ItalyDipartimento di FisicaUniversità di MilanoMilanoItaly94B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, BelarusB.I. Stepanov Institute of PhysicsNational Academy of Sciences of BelarusMinskBelarus95National Scientific and Educational Centre for Particle and High Energy Physics, Minsk, BelarusNational Scientific and Educational Centre for Particle and High Energy PhysicsMinskBelarus96Group of Particle Physics, University of Montreal, Montreal QC, CanadaGroup of Particle PhysicsUniversity of MontrealMontrealQCCanada97P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, RussiaP.N. Lebedev Physical Institute of the Russian Academy of SciencesMoscowRussia98Institute for Theoretical and Experimental Physics (ITEP), Moscow, RussiaInstitute for Theoretical and Experimental Physics (ITEP)MoscowRussia99National Research Nuclear University MEPhI, Moscow, RussiaNational Research Nuclear University MEPhIMoscowRussia100D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, RussiaD.V. Skobeltsyn Institute of Nuclear PhysicsM.V. Lomonosov Moscow State UniversityMoscowRussia101Fakultät für Physik, Ludwig-Maximilians-Universität München, München, GermanyFakultät für PhysikLudwig-Maximilians-Universität MünchenMünchenGermany102Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, GermanyMax-Planck-Institut für Physik (Werner-Heisenberg-Institut)MünchenGermany103Nagasaki Institute of Applied Science, Nagasaki, JapanNagasaki Institute of Applied ScienceNagasakiJapan104Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, JapanGraduate School of ScienceKobayashi-Maskawa InstituteNagoya UniversityNagoyaJapan105aINFN Sezione di Napoli, ItalyINFN Sezione di NapoliItaly105bDipartimento di Fisica, Università di Napoli, Napoli, ItalyDipartimento di FisicaUniversità di NapoliNapoliItaly106Department of Physics and Astronomy, University of New Mexico, Albuquerque NM, United StatesDepartment of Physics and AstronomyUniversity of New MexicoAlbuquerqueNMUnited States107Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, NetherlandsInstitute for Mathematics, Astrophysics and Particle PhysicsRadboud University Nijmegen/NikhefNijmegenNetherlands108Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, NetherlandsNikhef National Institute for Subatomic PhysicsUniversity of AmsterdamAmsterdamNetherlands109Department of Physics, Northern Illinois University, DeKalb IL, United StatesDepartment of PhysicsNorthern Illinois UniversityDeKalbILUnited States110Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, RussiaBudker Institute of Nuclear PhysicsSB RASNovosibirskRussia111Department of Physics, New York University, New York NY, United StatesDepartment of PhysicsNew York UniversityNew YorkNYUnited States112Ohio State University, Columbus OH, United StatesOhio State UniversityColumbusOHUnited States113Faculty of Science, Okayama University, Okayama, JapanFaculty of ScienceOkayama UniversityOkayamaJapan114Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman OK, United StatesHomer L. Dodge Department of Physics and AstronomyUniversity of OklahomaNormanOKUnited States115Department of Physics, Oklahoma State University, Stillwater OK, United StatesDepartment of PhysicsOklahoma State UniversityStillwaterOKUnited States116Palacký University, RCPTM, Olomouc, Czech RepublicPalacký UniversityRCPTMOlomoucCzech Republic117Center for High Energy Physics, University of Oregon, Eugene OR, United StatesCenter for High Energy PhysicsUniversity of OregonEugeneORUnited States118LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, FranceLALUniv. Paris-SudCNRS/IN2P3Université Paris-SaclayOrsayFrance119Graduate School of Science, Osaka University, Osaka, JapanGraduate School of ScienceOsaka UniversityOsakaJapan120Department of Physics, University of Oslo, Oslo, NorwayDepartment of PhysicsUniversity of OsloOsloNorway121Department of Physics, Oxford University, Oxford, United KingdomDepartment of PhysicsOxford UniversityOxfordUnited Kingdom122aINFN Sezione di Pavia, ItalyINFN Sezione di PaviaItaly122bDipartimento di Fisica, Università di Pavia, Pavia, ItalyDipartimento di FisicaUniversità di PaviaPaviaItaly123Department of Physics, University of Pennsylvania, Philadelphia PA, United StatesDepartment of PhysicsUniversity of PennsylvaniaPhiladelphiaPAUnited States124National Research Centre “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics Institute, St. Petersburg, RussiaNational Research Centre “Kurchatov Institute” B.P. Konstantinov Petersburg Nuclear Physics InstituteSt. PetersburgRussia125aINFN Sezione di Pisa, ItalyINFNSezione di PisaItaly125bDipartimento di Fisica E. Fermi, Università di Pisa, Pisa, ItalyDipartimento di Fisica E. FermiUniversità di PisaPisaItaly126Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh PA, United StatesDepartment of Physics and AstronomyUniversity of PittsburghPittsburghPAUnited States127aLaboratório de Instrumentação e Física Experimental de Partículas – LIP, Lisboa, PortugalLaboratório de Instrumentação e Física Experimental de PartículasLIPLisboaPortugal127bFaculdade de Ciências, Universidade de Lisboa, Lisboa, PortugalFaculdade de CiênciasUniversidade de LisboaLisboaPortugal127cDepartment of Physics, University of Coimbra, Coimbra, PortugalDepartment of PhysicsUniversity of CoimbraCoimbraPortugal127dCentro de Física Nuclear da Universidade de Lisboa, Lisboa, PortugalCentro de Física Nuclear da Universidade de LisboaLisboaPortugal127eDepartamento de Fisica, Universidade do Minho, Braga, PortugalDepartamento de FisicaUniversidade do MinhoBragaPortugal127fDepartamento de Fisica Teorica y del Cosmos and CAFPE, Universidad de Granada, Granada (Spain), PortugalDepartamento de Fisica Teorica y del CosmosCAFPEUniversidad de GranadaGranada (Spain)Portugal127gDep Fisica and CEFITEC of Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Caparica, PortugalDep FisicaCEFITEC of Faculdade de Ciencias e TecnologiaUniversidade Nova de LisboaCaparicaPortugal128Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech RepublicInstitute of PhysicsAcademy of Sciences of the Czech RepublicPrahaCzech Republic129Czech Technical University in Prague, Praha, Czech RepublicCzech Technical University in PraguePrahaCzech Republic130Faculty of Mathematics and Physics, Charles University in Prague, Praha, Czech RepublicFaculty of Mathematics and PhysicsCharles University in PraguePrahaCzech Republic131State Research Center Institute for High Energy Physics (Protvino), NRC KI, RussiaState Research Center Institute for High Energy Physics (Protvino)NRC KIRussia132Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United KingdomParticle Physics DepartmentRutherford Appleton LaboratoryDidcotUnited Kingdom133aINFN Sezione di Roma, ItalyINFN Sezione di RomaItaly133bDipartimento di Fisica, Sapienza Università di Roma, Roma, ItalyDipartimento di FisicaSapienza Università di RomaRomaItaly134aINFN Sezione di Roma Tor Vergata, ItalyINFN Sezione di Roma Tor VergataItaly134bDipartimento di Fisica, Università di Roma Tor Vergata, Roma, ItalyDipartimento di FisicaUniversità di Roma Tor VergataRomaItaly135aINFN Sezione di Roma Tre, ItalyINFN Sezione di Roma TreItaly135bDipartimento di Matematica e Fisica, Università Roma Tre, Roma, ItalyDipartimento di Matematica e FisicaUniversità Roma TreRomaItaly136aFaculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies – Université Hassan II, Casablanca, MoroccoFaculté des Sciences Ain ChockRéseau Universitaire de Physique des Hautes Energies – Université Hassan IICasablancaMorocco136bCentre National de l'Energie des Sciences Techniques Nucleaires, Rabat, MoroccoCentre National de l'Energie des Sciences Techniques NucleairesRabatMorocco136cFaculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, MoroccoFaculté des Sciences SemlaliaUniversité Cadi AyyadLPHEAMarrakechMorocco136dFaculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, MoroccoFaculté des SciencesUniversité Mohamed PremierLPTPMOujdaMorocco136eFaculté des sciences, Université Mohammed V, Rabat, MoroccoFaculté des sciencesUniversité Mohammed VRabatMorocco137DSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l'Univers), CEA Saclay (Commissariat à l'Energie Atomique et aux Energies Alternatives), Gif-sur-Yvette, FranceDSM/IRFU (Institut de Recherches sur les Lois Fondamentales de l'Univers)CEA Saclay (Commissariat à l'Energie Atomique et aux Energies Alternatives)Gif-sur-YvetteFrance138Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz CA, United StatesSanta Cruz Institute for Particle PhysicsUniversity of California Santa CruzSanta CruzCAUnited States139Department of Physics, University of Washington, Seattle WA, United StatesDepartment of PhysicsUniversity of WashingtonSeattleWAUnited States140Department of Physics and Astronomy, University of Sheffield, Sheffield, United KingdomDepartment of Physics and AstronomyUniversity of SheffieldSheffieldUnited Kingdom141Department of Physics, Shinshu University, Nagano, JapanDepartment of PhysicsShinshu UniversityNaganoJapan142Fachbereich Physik, Universität Siegen, Siegen, GermanyFachbereich PhysikUniversität SiegenSiegenGermany143Department of Physics, Simon Fraser University, Burnaby BC, CanadaDepartment of PhysicsSimon Fraser UniversityBurnabyBCCanada144SLAC National Accelerator Laboratory, Stanford CA, United StatesSLAC National Accelerator LaboratoryStanfordCAUnited States145aFaculty of Mathematics, Physics & Informatics, Comenius University, Bratislava, Slovak RepublicFaculty of Mathematics, Physics & InformaticsComenius UniversityBratislavaSlovak Republic145bDepartment of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak RepublicDepartment of Subnuclear PhysicsInstitute of Experimental Physics of the Slovak Academy of SciencesKosiceSlovak Republic146aDepartment of Physics, University of Cape Town, Cape Town, South AfricaDepartment of PhysicsUniversity of Cape TownCape TownSouth Africa146bDepartment of Physics, University of Johannesburg, Johannesburg, South AfricaDepartment of PhysicsUniversity of JohannesburgJohannesburgSouth Africa146cSchool of Physics, University of the Witwatersrand, Johannesburg, South AfricaSchool of PhysicsUniversity of the WitwatersrandJohannesburgSouth Africa147aDepartment of Physics, Stockholm University, SwedenDepartment of PhysicsStockholm UniversitySweden147bThe Oskar Klein Centre, Stockholm, SwedenThe Oskar Klein CentreStockholmSweden148Physics Department, Royal Institute of Technology, Stockholm, SwedenPhysics DepartmentRoyal Institute of TechnologyStockholmSweden149Departments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook NY, United StatesDepartments of Physics & Astronomy and ChemistryStony Brook UniversityStony BrookNYUnited States150Department of Physics and Astronomy, University of Sussex, Brighton, United KingdomDepartment of Physics and AstronomyUniversity of SussexBrightonUnited Kingdom151School of Physics, University of Sydney, Sydney, AustraliaSchool of PhysicsUniversity of SydneySydneyAustralia152Institute of Physics, Academia Sinica, Taipei, TaiwanInstitute of PhysicsAcademia SinicaTaipeiTaiwan153Department of Physics, Technion: Israel Institute of Technology, Haifa, IsraelDepartment of PhysicsTechnion: Israel Institute of TechnologyHaifaIsrael154Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelRaymond and Beverly Sackler School of Physics and AstronomyTel Aviv UniversityTel AvivIsrael155Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GreeceDepartment of PhysicsAristotle University of ThessalonikiThessalonikiGreece156International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, JapanInternational Center for Elementary Particle PhysicsDepartment of PhysicsThe University of TokyoTokyoJapan157Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, JapanGraduate School of Science and TechnologyTokyo Metropolitan UniversityTokyoJapan158Department of Physics, Tokyo Institute of Technology, Tokyo, JapanDepartment of PhysicsTokyo Institute of TechnologyTokyoJapan159Department of Physics, University of Toronto, Toronto ON, CanadaDepartment of PhysicsUniversity of TorontoTorontoONCanada160aTRIUMF, Vancouver BC, CanadaTRIUMFVancouverBCCanada160bDepartment of Physics and Astronomy, York University, Toronto ON, CanadaDepartment of Physics and AstronomyYork UniversityTorontoONCanada161Faculty of Pure and Applied Sciences, and Center for Integrated Research in Fundamental Science and Engineering, University of Tsukuba, Tsukuba, JapanFaculty of Pure and Applied SciencesCenter for Integrated Research in Fundamental Science and EngineeringUniversity of TsukubaTsukubaJapan162Department of Physics and Astronomy, Tufts University, Medford MA, United StatesDepartment of Physics and AstronomyTufts UniversityMedfordMAUnited States163Department of Physics and Astronomy, University of California Irvine, Irvine CA, United StatesDepartment of Physics and AstronomyUniversity of California IrvineIrvineCAUnited States164aINFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, ItalyINFN Gruppo Collegato di UdineSezione di TriesteUdineItaly164bICTP, Trieste, ItalyICTPTriesteItaly164cDipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, ItalyDipartimento di Chimica, Fisica e AmbienteUniversità di UdineUdineItaly165Department of Physics and Astronomy, University of Uppsala, Uppsala, SwedenDepartment of Physics and AstronomyUniversity of UppsalaUppsalaSweden166Department of Physics, University of Illinois, Urbana IL, United StatesDepartment of PhysicsUniversity of IllinoisUrbanaILUnited States167Instituto de Fisica Corpuscular (IFIC) and Departamento de Fisica Atomica, Molecular y Nuclear and Departamento de Ingeniería Electrónica and Instituto de Microelectrónica de Barcelona (IMB-CNM), University of Valencia and CSIC, Valencia, SpainInstituto de Fisica Corpuscular (IFIC)Departamento de Fisica AtomicaMolecular y NuclearDepartamento de Ingeniería ElectrónicaInstituto de Microelectrónica de Barcelona (IMB-CNM)University of ValenciaCSICValenciaSpain168Department of Physics, University of British Columbia, Vancouver BC, CanadaDepartment of PhysicsUniversity of British ColumbiaVancouverBCCanada169Department of Physics and Astronomy, University of Victoria, Victoria BC, CanadaDepartment of Physics and AstronomyUniversity of VictoriaVictoriaBCCanada170Department of Physics, University of Warwick, Coventry, United KingdomDepartment of PhysicsUniversity of WarwickCoventryUnited Kingdom171Waseda University, Tokyo, JapanWaseda UniversityTokyoJapan172Department of Particle Physics, The Weizmann Institute of Science, Rehovot, IsraelDepartment of Particle PhysicsThe Weizmann Institute of ScienceRehovotIsrael173Department of Physics, University of Wisconsin, Madison WI, United StatesDepartment of PhysicsUniversity of WisconsinMadisonWIUnited States174Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, GermanyFakultät für Physik und AstronomieJulius-Maximilians-UniversitätWürzburgGermany175Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, GermanyFakultät für Mathematik und NaturwissenschaftenFachgruppe PhysikBergische Universität WuppertalWuppertalGermany176Department of Physics, Yale University, New Haven CT, United StatesDepartment of PhysicsYale UniversityNew HavenCTUnited States177Yerevan Physics Institute, Yerevan, ArmeniaYerevan Physics InstituteYerevanArmenia178Centre de Calcul de l'Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, FranceCentre de Calcul de l'Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)VilleurbanneFrance1Also at Department of Physics, King's College London, London, United Kingdom.2Also at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan.3Also at Novosibirsk State University, Novosibirsk, Russia.4Also at TRIUMF, Vancouver BC, Canada.5Also at Department of Physics & Astronomy, University of Louisville, Louisville, KY, United States of America.6Also at Department of Physics, California State University, Fresno CA, United States of America.7Also at Department of Physics, University of Fribourg, Fribourg, Switzerland.8Also at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain.9Also at Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Portugal.10Also at Tomsk State University, Tomsk, Russia.11Also at Universita di Napoli Parthenope, Napoli, Italy.12Also at Institute of Particle Physics (IPP), Canada.13Also at National Institute of Physics and Nuclear Engineering, Bucharest, Romania.14Also at Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg, Russia.15Also at Department of Physics, The University of Michigan, Ann Arbor MI, United States of America.16Also at Centre for High Performance Computing, CSIR Campus, Rosebank, Cape Town, South Africa.17Also at Louisiana Tech University, Ruston LA, United States of America.18Also at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain.19Also at Graduate School of Science, Osaka University, Osaka, Japan.20Also at Department of Physics, National Tsing Hua University, Taiwan.21Also at Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands.22Also at Department of Physics, The University of Texas at Austin, Austin TX, United States of America.23Also at CERN, Geneva, Switzerland.24Also at Georgian Technical University (GTU),Tbilisi, Georgia.25Also at Ochadai Academic Production, Ochanomizu University, Tokyo, Japan.26Also at Manhattan College, New York NY, United States of America.27Also at Hellenic Open University, Patras, Greece.28Also at Academia Sinica Grid Computing, Institute of Physics, Academia Sinica, Taipei, Taiwan.29Also at School of Physics, Shandong University, Shandong, China.30Also at Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia.31Also at Section de Physique, Université de Genève, Geneva, Switzerland.32Also at Eotvos Lorand University, Budapest, Hungary.33Also at Departments of Physics & Astronomy and Chemistry, Stony Brook University, Stony Brook NY, United States of America.34Also at International School for Advanced Studies (SISSA), Trieste, Italy.35Also at Department of Physics and Astronomy, University of South Carolina, Columbia SC, United States of America.36Also at School of Physics and Engineering, Sun Yat-sen University, Guangzhou, China.37Also at Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia, Bulgaria.38Also at Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia.39Also at Institute of Physics, Academia Sinica, Taipei, Taiwan.40Also at National Research Nuclear University MEPhI, Moscow, Russia.41Also at Department of Physics, Stanford University, Stanford CA, United States of America.42Also at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary.43Also at Flensburg University of Applied Sciences, Flensburg, Germany.44Also at University of Malaya, Department of Physics, Kuala Lumpur, Malaysia.45Also at CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.⁎Deceased.⋆E-mail address: atlas.publications@cern.ch.Editor: W.-D. SchlatterAbstractThis paper describes a measurement of the inclusive top quark pair production cross-section (σtt¯) with a data sample of 3.2fb−1 of proton–proton collisions at a centre-of-mass energy of s=13TeV, collected in 2015 by the ATLAS detector at the LHC. This measurement uses events with an opposite-charge electron–muon pair in the final state. Jets containing b-quarks are tagged using an algorithm based on track impact parameters and reconstructed secondary vertices. The numbers of events with exactly one and exactly two b-tagged jets are counted and used to determine simultaneously σtt¯ and the efficiency to reconstruct and b-tag a jet from a top quark decay, thereby minimising the associated systematic uncertainties. The cross-section is measured to be:σtt¯=818±8(stat)±27(syst)±19(lumi)±12(beam) pb, where the four uncertainties arise from data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The result is consistent with theoretical QCD calculations at next-to-next-to-leading order. A fiducial measurement corresponding to the experimental acceptance of the leptons is also presented.1IntroductionThe top quark is the heaviest known fundamental particle, with a mass mt which is much larger than any of the other quarks, and close to the scale of electroweak symmetry breaking. The study of its production and decay properties forms a core part of the LHC physics programme. At the LHC, top quarks are primarily produced in quark–antiquark pairs (tt¯), and the precise prediction of the corresponding inclusive cross-section is sensitive to the gluon parton distribution function (PDF) and the top quark mass, and presents a substantial challenge for QCD calculational techniques. Physics beyond the Standard Model may also lead to an enhancement of the tt¯ production rate.Calculations of the tt¯ production cross-section at hadron colliders are available at full next-to-next-to-leading-order (NNLO) accuracy in the strong coupling constant αS, including the resummation of next-to-next-to-leading logarithmic (NNLL) soft gluon terms [1–5]. In this paper a reference value of 832−46+40pb at a centre-of-mass energy of s=13TeV assuming mt=172.5GeV is used, corresponding to a relative precision of %−5.5+4.8. This value was calculated using the top++ 2.0 program [6]. The combined PDF and αS uncertainties of ±35pb were calculated using the PDF4LHC prescription [7] with the MSTW2008 68% CL NNLO [8,9], CT10 NNLO [10,11] and NNPDF2.3 5f FFN [12] PDF sets, and added in quadrature to the factorisation and renormalisation scale uncertainty of −29+20pb. The cross-section at s=13TeV is predicted to be 3.3 times larger than the cross-section at s=8TeV.Measurements of σtt¯ have been made at s=7 and 8 TeV by both ATLAS [13–15] and CMS [16–18]. The most precise ATLAS measurements of σtt¯ at these collision energies were made using events with an opposite-charge isolated electron and muon pair and additional b-tagged jets [13]. This paper documents a measurement of σtt¯ at s=13TeV using the same final state and analysis technique. Wherever possible, the analysis builds on the studies and procedures used in the earlier publication [13]. A fiducial measurement determining the cross-section in the region corresponding to the experimental lepton acceptance is also presented.The data and Monte Carlo simulation samples are described in Section 2, followed by the object and event selection in Section 3 and the method for determining the tt¯ cross-section in Section 4. The evaluation of backgrounds is discussed in Section 5 and the systematic uncertainties in Section 6. Finally, the results and conclusions are given in Section 7.2Data and simulation samplesThe analysis is performed using the full 2015 proton–proton (pp) collision data sample at s=13TeV with 25 ns bunch spacing recorded by the ATLAS detector [19,20]. The data correspond to an integrated luminosity of 3.2fb−1 after requiring stable LHC beams and that all detector subsystems were operational. Events are required to pass either a single-electron or single-muon trigger, with thresholds set to be almost fully efficient for leptons with transverse momentum pT>25GeV passing offline selections. Each event includes the signals from on average about 14 additional inelastic pp collisions in the same bunch crossing (known as pile-up).Monte Carlo simulated event samples are used to optimise the analysis, to compare to the data, and to evaluate signal and background efficiencies and uncertainties. The samples used in the analysis are summarised in Table 1. The main tt¯ signal and background samples were processed through the ATLAS detector simulation [21] based on GEANT4 [22]. Some of the systematic uncertainties were studied using alternative tt¯ samples processed through a faster simulation making use of parameterised showers in the calorimeters [23]. Additional simulated pp collisions generated with Pythia8.186 [24] were overlaid to model the effects from additional collisions in the same and nearby bunch crossings. All simulated events were processed using the same reconstruction algorithms and analysis chain as the data, and small corrections were applied to lepton trigger and reconstruction efficiencies and resolutions to improve the agreement with the response observed in data.The baseline tt¯ simulation sample was produced at next-to-leading order (NLO) in QCD using the matrix-element generator Powheg-Box v2 [25–27] with CT10 PDFs [10], interfaced to Pythia6 [28] with the Perugia 2012 set of tuned parameters (tune) [29] for parton shower, fragmentation and underlying event modelling. The hdamp parameter, which gives a cutoff scale for the first gluon emission, was set to mt, a value which was chosen to give good modelling of the tt¯ system pT at s=7TeV [30]. The EvtGen [31] package was used to better simulate the decay of heavy-flavour hadrons.Alternative tt¯ simulation samples were generated using Powheg interfaced to Herwig++ [32], and Madgraph5_aMC@NLO [33] interfaced to Herwig++. The effects of initial- and final-state radiation were explored using two alternative Powheg+Pythia6 samples: one with hdamp set to 2mt, the factorisation and renormalisation scale varied by a factor of 0.5 and using the Perugia 2012 radHi tune, giving more parton shower radiation; and a second one with the Perugia 2012 radLo tune, hdamp=mt and the factorisation and renormalisation scale varied by a factor of 2, giving less parton shower radiation. The samples were simulated following the recommendations documented in Ref. [34]. The top quark mass was set to 172.5 GeV in all these simulation samples and the t→Wb branching fraction to 100%.Backgrounds in this measurement are classified into two types: those with two real prompt leptons from W or Z decays (including those produced via leptonic decays of τ-leptons), and those where at least one of the reconstructed lepton candidates is ‘fake’, i.e. a non-prompt lepton produced from the decay of a bottom or charm hadron, an electron arising from a photon conversion, a jet misidentified as an electron, or a muon produced from an in-flight decay of a pion or kaon. Backgrounds containing two real prompt leptons include single-top production in association with a W boson (Wt), Z+jets production with Z→ττ→eμ, and diboson production (WW, WZ and ZZ) where both bosons decay leptonically.The dominant Wt single-top background was modelled using Powheg-Box v1+Pythia6 with the CT10 PDFs and the Perugia 2012 tune, using the ‘diagram removal’ generation scheme [35]. The Z+jets background was modelled using Sherpa 2.1.1 [36]: matrix elements (ME) were calculated for up to two partons at NLO and four partons at leading order using the Comix [37] and OpenLoops [38] matrix-element generators and merged with the Sherpa parton shower (PS) using the ME+PS@NLO [39] prescription; the CT10 PDF set was used in conjunction with dedicated parton shower tuning in Sherpa. Diboson production with additional jets was also simulated using Sherpa 2.1.1 and CT10 PDFs as described above; the four-lepton final state, the three-lepton final state with two different-flavour leptons, and the two-lepton final state were simulated to cover ZZ, ZW and WW production, and include off-shell Z/γ⁎ contributions. Same-charge WW production from QCD and electroweak processes was included. Alternative Wt and diboson simulation samples were generated using Powheg+Herwig++ and Powheg+Pythia8, respectively, to estimate the background modelling uncertainties.The majority of the background with at least one fake lepton in the selected sample arises from tt¯ production where only one of the W bosons from the top quarks decays leptonically, which was simulated as discussed earlier. Other processes with one real lepton which can contribute to this background include the t-channel single-top production, modelled using Powheg-Box v1+Pythia6, and W+jets with the W decaying to eν, μν or τν where the τ-lepton subsequently decays leptonically. This background was modelled using Powheg-Box v2+Pythia8 with the CT10 PDFs. The small expected contribution from tt¯ in association with a W or Z boson to the same-charge eμ sample used for background estimation was modelled using MadGraph+Pythia8 [40]. Other backgrounds, including processes with two misidentified leptons, are negligible.3Object and event selectionThis measurement makes use of reconstructed electrons, muons and b-tagged jets. The object and event selections largely follow those used in the earlier publication; in particular the same kinematic cuts are used for electrons and jets, and very similar ones are used for muons.Electron candidates are reconstructed from an isolated electromagnetic calorimeter energy deposit matched to a track in the inner detector and passing a medium likelihood-based requirement [41,42], within the fiducial region of transverse energy ET>25GeV and pseudorapidity11ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the centre of the detector and the z-axis along the beam pipe. The x-axis points from the IP to the centre of the LHC ring, and the y-axis points upwards. Cylindrical coordinates (r,ϕ) are used in the transverse plane, ϕ being the azimuthal angle around the z-axis. The pseudorapidity is defined in terms of the polar angle θ as η=−ln⁡tan⁡(θ/2). Angular distance is measured in units of ΔR≡(Δη)2+(Δϕ)2. |η|<2.47. Candidates within the transition region between the barrel and endcap electromagnetic calorimeters, 1.37<|η|<1.52, are removed. The electron candidates must satisfy requirements on the transverse impact parameter significance calculated with respect to the beamline of |d0|/σd0<5 and on the longitudinal impact parameter calculated with respect to the primary vertex of |Δz0sin⁡θ|<0.5 mm. The primary vertex is defined as the one with the highest sum of pT2 of tracks associated to it. Electrons are required to be isolated using requirements on the calorimeter energy in a cone of size ΔR<0.2 around the electron (excluding the deposit from the electron itself) divided by the electron pT, and on the sum of track pT in a variable-size cone around the electron direction (again excluding the electron track itself). The track isolation cone size is given by the smaller of ΔR=10GeV/pT(e) and ΔR=0.2, i.e. a cone which increases in size at low pT up to a maximum of 0.2. Selection criteria, dependent on pT and η, are applied to produce a nominal efficiency of 95% for electrons from Z→ee decays with pT of 25 GeV which rises to 99% at 60 GeV. The efficiencies in tt¯ events are smaller, due to the increased jet activity. To prevent double-counting of electron energy deposits as jets, the closest jet with ΔR<0.2 of a reconstructed electron is removed. Finally, if the nearest jet surviving the above selection is within ΔR=0.4 of the electron, the electron is discarded, to ensure it is sufficiently separated from nearby jet activity.Muon candidates are reconstructed by combining matching tracks reconstructed in both the inner detector and muon spectrometer, and are required to satisfy pT>25 GeV and |η|<2.4 [43]. Muons are also required to be isolated, using requirements similar to those for electrons, with the selection criteria tuned to give similar efficiencies for Z→μμ events. The muon candidates must satisfy the requirements on the transverse impact parameter significance and on the longitudinal impact parameter of |d0|/σd0<3 and |Δz0sin⁡θ|<0.5 mm, respectively. To reduce the background from muons from heavy-flavour decays inside jets, muons are removed if they are separated from the nearest jet by ΔR<0.4. However, if this jet has fewer than three associated tracks, the muon is kept and the jet is removed instead; this avoids an inefficiency for high-energy muons undergoing significant energy loss in the calorimeter.Jets are reconstructed using the anti-kt algorithm [44,45] with radius parameter R=0.4, starting from topological clusters of deposited energy in the calorimeters. Jets are calibrated using an energy- and η-dependent simulation-based calibration scheme with corrections derived from data. No corrections for semileptonic b-hadron decays are applied. Jets are accepted within the fiducial region pT>25GeV and |η|<2.5. To reduce the contribution from jets associated with pile-up, jets with pT<50GeV and |η|<2.4 are required to pass a pile-up rejection veto [46].Jets are b-tagged as likely to contain b-hadrons using the MV2c20 algorithm [47], a multivariate discriminant making use of track impact parameters and reconstructed secondary vertices and tuned with the new detector configuration, i.e. including the Insertable B-Layer detector (IBL) [20]. Jets are defined as being b-tagged if the MV2c20 weight is larger than a threshold value corresponding to approximately 70% b-tagging efficiency for b-jets in tt¯ events, although the exact efficiency varies with pT. In simulation, the tagging algorithm gives a rejection factor of about 440 against light-quark and gluon jets, and about 8 against jets originating from charm quarks. The improvements of a factor of three in the light-quark rejection and of 60% in the charm-quark rejection compared to the b-tagging algorithm used in Ref. [13] originate from the gain in track impact parameter resolution from the IBL, and improvements in the track reconstruction and b-tagging algorithms [47].Events are rejected if the selected electron and muon are separated by Δϕ<0.15rad and Δθ<0.15rad, where Δϕ and Δθ are the differences in polar and azimuthal angles between the two leptons. This requirement rejects events where a muon undergoes significant energy loss in the electromagnetic calorimeter, thus leading to a reconstructed electron candidate. Events passing the above requirements, and having exactly one selected electron and one selected muon of opposite electric charge sign (OS), define the eμ preselected sample. The corresponding same-sign (SS) sample is used in the estimation of background from events with misidentified leptons. Events are then further classified into those with exactly one or exactly two b-tagged jets.4Extraction of the tt¯ cross-sectionThe tt¯ cross-section is measured in the dileptonic eμ channel, where one top quark decays as t→Wb→eνb and the other as t→Wb→μνb.22This notation indicates the leptonic decay of both t and t¯. Charge-conjugate modes are implied unless otherwise stated. The final states from leptonic τ decays are also included. As in Ref. [13], σtt¯ is determined by counting the numbers of opposite-sign eμ events with exactly one (N1) and exactly two (N2) b-tagged jets, ignoring any jets that are not b-tagged which may be present, due to e.g. light-quark or gluon jets from QCD radiation or b-jets from top quark decays which are not b-tagged. The two event counts can be expressed as:(1)N1=Lσtt¯ϵeμ2ϵb(1−Cbϵb)+N1bkgN2=Lσtt¯ϵeμCbϵb2+N2bkg where L is the integrated luminosity of the sample and ϵeμ the efficiency for a tt¯ event to pass the opposite-sign eμ preselection. The combined probability for a jet from the quark q in the t→Wq decay to fall within the acceptance of the detector, be reconstructed as a jet with transverse momentum above the selection threshold, and be tagged as a b-jet, is denoted by ϵb. If the decays of the two top quarks and the subsequent reconstruction of the two b-tagged jets are completely independent, the probability to tag both b-jets ϵbb is given by ϵbb=ϵb2. In practice, small correlations are present for kinematic and instrumental reasons, and these are taken into account via the tagging correlation coefficient Cb, defined as Cb=ϵbb/ϵb2 or equivalently Cb=4Neμtt¯N2tt¯/(N1tt¯+2N2tt¯)2, where Neμtt¯ is the number of preselected eμ tt¯ events and N1tt¯ and N2tt¯ are the numbers of events with one and two b-tagged jets. Background from sources other than tt¯→eμνν‾bb¯ also contributes to the event counts N1 and N2, and is given by the background terms N1bkg and N2bkg. The preselection efficiency ϵeμ and tagging correlation Cb are taken from tt¯ event simulation and are about 0.83% and 1.002, respectively, and the background contributions N1bkg and N2bkg are estimated using a combination of simulation and data-based methods as described in Section 5, allowing the two equations (1) to be solved yielding σtt¯ and ϵb by minimising a likelihood function.In the method to measure the tt¯ cross-section outlined above, some of the largest systematic uncertainties come from the use of simulation to estimate the preselection efficiency ϵeμ. This efficiency can be factorised into the product of two terms: ϵeμ=AeμGeμ. The acceptance Aeμ represents the fraction of tt¯ events that have a true eμ pair within the detector acceptance (pT>25GeV and |η|<2.5) and it is about 2.7% (2.3% excluding τ decays). The term Geμ represents the ratio of reconstructed tt¯ events to tt¯ events with a true eμ pair within the fiducial region, where the numerator includes the approximately 2% of reconstructed tt¯ events where one or both leptons have true pT<25GeV. The fiducial cross-section σtt¯fid is defined as σtt¯fid=Aeμσtt¯, avoiding the systematic uncertainties associated with the extrapolation from the measured lepton phase space to the full phase space, and measured following the same technique as in Ref. [13]. The contribution of tt¯ events produced in the fiducial region with at least one lepton originating via W→τ→l decay is estimated from simulation to be 12.2±0.1%.A total of 30879 data events passed the eμ opposite-sign preselection. Table 2 shows the number of events with one and two b-tagged jets, together with the estimates of non-tt¯ background and their systematic uncertainties discussed below. The ratio of b-tagged events to preselected events (before b-tagging) is higher for 13 TeV than at 7 and 8 TeV due to the larger increase of the tt¯ cross-section with s compared with the Z+jets and diboson background cross-sections. In simulation, the sample with one b-tagged jet is expected to be about 89% pure in tt¯ events, with the dominant background originating from Wt single-top production, and smaller contributions from events with misidentified leptons, Z+jets and dibosons. The sample with two b-tagged jets is expected to be about 96% pure in tt¯ events, with Wt production again being the dominant background.The distribution of the number of b-tagged jets in opposite-sign eμ events is shown in Fig. 1, and compared to the baseline and alternative tt¯ and background simulation samples. The tt¯ contribution is normalised to the theoretical tt¯ cross-section prediction at s=13TeV of 832 pb. The agreement between data and simulation in the one and two b-tagged bins used for the cross-section measurement is good. However, the data has about 40% more events with three or more b-tags than the baseline simulation, indicating a mismodelling of events with tt¯ produced in association with additional heavy-flavour jets, as discussed further in Section 6. There is also an approximately 11% excess of data over simulation for events with zero b-tagged jets which does not affect the measurement, and is compatible with the expected uncertainties in modelling WW [48] and Z+jets production. Distributions of the number of jets, the jet pT, and the electron and muon |η| and pT are shown for opposite-sign eμ events with at least one b-tagged jet in Fig. 2, where the simulation is normalised to the same number of events as the data. In general, the data and simulation agree well.5Background estimationMost background contributions are estimated from simulation. The Wt single-top background is normalised to the approximate NNLO cross-section of 71.7±3.8 pb, determined as in Ref. [49]. The diboson background normalisation is estimated using Sherpa as discussed in Section 2. The normalisation of the Z+jets background, originating from events with a Z→ττ→eμ decay accompanied by one or two b-tagged jets, is determined by scaling the Sherpa simulation with scale factors obtained in Z→ee and Z→μμ events as described in Section 6.The background from events with one real and one misidentified lepton is estimated from a combination of data and simulation, using the method employed in Ref. [13]. Simulation studies show that the samples with a same-sign eμ pair and one or two b-tagged jets are dominated by events with a misidentified lepton, with rates comparable to those in the opposite-sign sample. The contributions of events with misidentified leptons are therefore estimated using the same-sign event counts in data after subtraction of the estimated prompt same-sign contributions, multiplied by the opposite- to same-sign fake-lepton ratios Rj for j=1 and 2 b-tagged jets predicted from simulation. The results are shown in Table 2 and the procedure is illustrated in Table 3, which shows the expected breakdown of same-sign event counts in terms of prompt-lepton and misidentified-lepton events, and the corresponding predictions for misidentified leptons in the opposite-sign sample with all contributions estimated from simulation. The misidentified-lepton contributions are classified into those where the electron is from a photon conversion, from the decay of a heavy-flavour hadron or from other sources (e.g. a misidentified hadron within a jet), or the muon is from a heavy-flavour decay or other sources (e.g. a pion or kaon decay). The values of Rj are taken to be R1=1.55±0.50 and R2=1.99±0.82, where the central values are taken from ratios of the total numbers of misidentified-lepton events in opposite- and same-sign samples. The uncertainties encompass the different values of Rj predicted for the various sub-components of the misidentified-lepton background separately, allowing the background composition to be significantly different from that predicted by simulation, where it is dominated by electrons from photon conversions, followed by electrons and muons from the decays of heavy-flavour hadrons. A 50% uncertainty is assigned to the prompt same-sign contribution, which includes events where the charge of the electron was misidentified (denoted by wrong-sign prompt in Table 3) or right-sign with two genuine same-sign leptons (e.g. from tt¯W/Z production). The largest uncertainties in the misidentified-lepton background come from the uncertainties in Rj.The modelling in simulation of the different components of the misidentified-lepton background is checked by studying kinematic distributions of same-sign events, as illustrated for the pT and |η| distributions of the leptons in events with at least one b-tagged jet in Fig. 3. The simulation models the shapes of the distributions well, but underestimates the number of data events with two b-tagged jets by about 40%, as shown in Table 3. This deficit in simulation is attributed to a larger rate of misidentified-lepton events in data, which increases the estimate of misidentified leptons in the opposite-sign two-b-tag sample accordingly. The modelling is also checked in same-sign control samples with relaxed isolation cuts, enhancing the contributions of heavy-flavour decays, and similar levels of agreement were found, giving confidence that the simulation adequately models the different sources of misidentified leptons in the selected sample.6Systematic uncertaintiesThe systematic uncertainties in the extracted cross-sections, σtt¯ and σtt¯fid, are shown in Table 4, together with their effects (where relevant) on the tt¯ preselection efficiency ϵeμ, tagging correlation Cb and reconstruction efficiency Geμ. Each source of uncertainty is evaluated by repeating the cross-section extraction with all relevant input parameters simultaneously changed by ±1 standard deviation. Correlations between input parameters (in particular significant anti-correlations between ϵeμ and Cb which contribute with opposite signs to σtt¯) are thus taken into account. The total uncertainties are calculated by adding the effects of all the individual systematic components in quadrature, assuming them to be independent. The sources of systematic uncertainty are discussed in detail below. tt¯ modelling:The modelling uncertainties in ϵeμ and Cb due to the choice of tt¯ generator are assessed by comparing the predictions of the baseline Powheg+Pythia6 sample with the various alternative samples discussed in Section 2. Three separate uncertainties are considered: the NLO generator uncertainty (evaluated by considering the relative difference between MadGraph5_aMC@NLO+Herwig++ and Powheg+Herwig++), the parton shower and hadronisation uncertainty (evaluated by considering the relative difference between Powheg+Pythia6 and Powheg+Herwig++), and the radiation uncertainty (evaluated by considering half the relative difference between the Powheg+Pythia6 samples with more or less radiation). The prediction for ϵeμ is found to be particularly sensitive to the amount of hadronic activity near the leptons, which strongly affects the efficiency of the lepton isolation requirements described in Section 3. These isolation efficiencies are therefore measured directly from data, as discussed below, and thus no modelling uncertainty is considered for the lepton isolation. Motivated by the level of agreement for events with at least three b-tags seen in Fig. 1, an additional uncertainty in Cb is determined by calculating in data and simulation the ratio R32 of the number of events with at least three b-tagged jets to the number with at least two. The baseline simulation sample is reweighted to change the fraction of events with at least three b-jets at generator level, which effectively changes the tt¯ plus heavy-flavour fraction and the values of both Cb and R32. A linear relation between changes in Cb and R32 is found, and used to translate the difference between the R32 values found in data (3.1±0.2%) and simulation (2.21±0.05%) to a shift in Cb of 0.39%. This shift is treated as an additional uncertainty in Cb due to the modelling of heavy-flavour production in tt¯ events, uncorrelated to the NLO, hadronisation and radiation uncertainties discussed above.Parton distribution functions:The uncertainties in ϵeμ and Cb due to limited knowledge of the proton PDFs are evaluated by reweighting simulated events produced with MadGraph5_aMC@NLO using the error sets of the NNPDF 3.0 PDF sets [50]. The eigenvectors consist of a central PDF and 100 Monte Carlo replicas, for which the root mean square was taken to calculate the uncertainty. The MadGraph5_aMC@NLO sample was produced with CT10; therefore the cross-section was corrected for the relative difference between the central prediction of CT10 and NNPDF 3.0, which is about 1%. The uncertainty using the PDF4LHC Run-2 recommendations with 100 eigenvectors [51] is very similar to that obtained with NNPDF 3.0.Single-top modelling:The uncertainties related to Wt single-top modelling are assessed by comparing the predictions of Powheg+Pythia6 and Powheg+Herwig++ and considering the relative difference, comparing the diagram removal and diagram subtraction schemes for dealing with the interference between the tt¯ and Wt final states, and also considering half the relative difference between the Powheg+Pythia6 samples with more or less radiation. Production of single top quarks via the t- and s-channels gives rise to final states with only one prompt lepton, and is accounted for as part of the misidentified-lepton background.Diboson modelling:The uncertainties in the background contributions from dibosons with one or two additional b-tagged jets were assessed by comparing the baseline prediction from Sherpa with that of Powheg+Pythia8. These uncertainties have a limited effect on the cross-section measurement due to the small number of diboson background events.Background cross-sections:The uncertainties in the Wt single-top and diboson cross-sections are taken to be 5.3% [49] and 6% [52], based on the corresponding theoretical predictions.Z+ jets extrapolation:The cross-sections for Z+jets and especially Z + heavy-flavour jets are subject to large theoretical uncertainties, making purely simulation-based estimates unreliable. This background was therefore determined by measuring the rates of Z→ee and Z→μμ events with one and two b-tagged jets in both data and simulation, and using the resulting ratio to scale the simulation estimate of background from Z→ττ+jets. The Z+jets background prediction from simulation was scaled by 1.1 for the background with one b-tagged jet and by 1.2 for the background with two b-tagged jets. A 50% uncertainty was applied to the Z+jets contributions which cover the differences observed on the event yields comparing Z+jets Sherpa vs Powheg+Pythia8.Lepton-related uncertainties:The modelling of the electron and muon trigger efficiencies, identification efficiencies, energy scales and resolutions are studied using Z→ee and Z→μμ decays in data and simulation. Small corrections are applied to the simulation to improve the agreement with the response observed in data. These corrections have associated uncertainties that are propagated to the cross-section measurement. The uncertainty in the trigger efficiency is small compared to those for electron or muon identification since most events are triggered redundantly by both leptons. The efficiency of the lepton isolation requirements was measured directly in data tt¯ events, thus including the effects of pile-up, by relaxing the cuts alternately on electrons and muons as in Ref. [13]. The results, after the correction for the contamination from misidentified leptons estimated using the same-sign eμ samples as described in Section 5, showed that the baseline Powheg+Pythia6 simulation overestimates the efficiencies of the isolation requirements by about 0.2% for both the electrons and muons. These corrections were applied to ϵeμ  and the corresponding uncertainties are dominated by the subtraction of misidentified leptons.Jet-related uncertainties:Although the efficiency to reconstruct and b-tag jets from tt¯ events is extracted from the data, uncertainties in the jet energy scale, energy resolution and reconstruction efficiency affect the backgrounds estimated from simulation and the estimate of the tagging correlation Cb. They also have a small effect on ϵeμ via the lepton–jet ΔR separation cuts. The jet energy scale is varied in simulation according to the uncertainties derived from the s=8TeV simulation and data calibration, extrapolated to s=13TeV [53]. The uncertainties are evaluated using a model with 19 separate orthogonal components and the resulting variations were added in quadrature. The jet energy resolution uncertainty is also assessed using s=8TeV data, and extrapolated to s=13TeV.b-tagging uncertainties:The correlation factor Cb depends weakly on the b-tagging and mistagging efficiencies predicted by the simulation, as it is evaluated from the numbers of events with one and two b-tagged jets. The uncertainties are determined from s=8TeV data, with additional uncertainties to account for the presence of the newly-installed insertable B-layer detector (IBL) [20] and the extrapolation to s=13TeV. Since the definition of ϵeμ does not involve b-tagged jets, it has no b-tagging or mistagging-related uncertainties.Misidentified leptons:The uncertainties in the number of events with misidentified leptons in the one and two b-tagged samples are derived from the statistical uncertainties in the numbers of same-sign lepton events, the systematic uncertainties in the opposite- to same-sign ratios Rj, and the uncertainties in the numbers of prompt same-sign events, as discussed in detail in Section 5.Integrated luminosity:The uncertainty in the integrated luminosity is 2.1%. It is derived, following a methodology similar to that detailed in Ref. [54], from a calibration of the luminosity scale using x–y beam-separation scans performed in August 2015. The effect on the cross-section measurement is slightly larger than 2.1% because the Wt single-top and diboson backgrounds are evaluated from simulation, so they are also sensitive to the assumed integrated luminosity.LHC beam energy:The LHC beam energy during the 2012 pp run was calibrated to be 0.30±0.66% smaller than the nominal value of 4 TeV per beam, using the revolution frequency difference of protons and lead ions during p+Pb runs in early 2013 [55]. This relative uncertainty is also applicable to the 2015 pp run. Since this calibration is compatible with the nominal centre-of-mass energy of 13 TeV, no correction is applied to the measured σtt¯ value. However, an uncertainty of 1.5%, corresponding to the expected change in σtt¯ for a 0.66% change in centre-of-mass energy, is quoted separately for the final result.Top quark mass:Alternative tt¯ samples generated with different mt from 170 to 177.5 GeV are used to quantify the dependence of the acceptance for tt¯ events on the assumed mt value. The level of Wt single-top background based on the change of the Wt cross-section for the same mass range is also considered. The tt¯ acceptance and background effects partially cancel, and the final dependence of the result on the assumed mt value is determined to be dσtt¯/dmt=−0.3%/GeV. The result of the analysis is reported for a top quark mass of 172.5 GeV, and the small dependence of the cross-section on the assumed mass is not included in the total systematic uncertainty.The total systematic uncertainties in ϵeμ, Cb, Geμ and the fitted values of σtt¯ and σtt¯fid are shown in Table 4, and the total systematic uncertainties in the individual background components are shown in Table 2. The dominant uncertainties in the cross-section result come from the luminosity determination and tt¯ modelling, in particular from the tt¯ shower and hadronisation uncertainty.7Results and conclusionsThe inclusive tt¯ production cross-section is measured in the dilepton tt¯→eμνν‾bb¯ decay channel using 3.2fb−1 of s=13 TeV pp collisions recorded by the ATLAS detector at the LHC. The numbers of opposite-sign eμ events with one and two b-tagged jets are counted, allowing a simultaneous determination of the tt¯ cross-section σtt¯ and the probability to reconstruct and b-tag a jet from a tt¯ decay. Assuming a top quark mass of mt=172.5GeV, the result is:σtt¯=818±8(stat)±27(syst)±19(lumi)±12(beam) pb, where the four uncertainties are due to data statistics, experimental and theoretical systematic effects, the integrated luminosity and the LHC beam energy, giving a total relative uncertainty of 4.4%. The combined probability for a jet from a top quark decay to be within the detector acceptance and tagged as a b-jet is measured to be ϵb=0.559±0.004±0.003, where the first error is statistical and the second systematic, in fair agreement with the nominal prediction from simulation of 0.549.This cross-section measurement is consistent with the theoretical prediction based on NNLO+NNLL calculations of 832−46+40pb at mt=172.5GeV. Fig. 4 shows the result of this σtt¯ measurement together with the most precise ATLAS results at s=7 and 8 TeV [13]. The data are compared to the NNLO+NNLL predictions as a function of the centre-of-mass energy. The result is also consistent with a recent measurement by CMS at s=13 TeV using a smaller data sample [56].The measured fiducial cross-section σtt¯fid for a tt¯ event producing an eμ pair, each lepton originating directly from t→W→ℓ or via a leptonic τ decay t→W→τ→ℓ and satisfying pT>25GeV and |η|<2.5 is:σtt¯fid=11.32±0.10(stat)±0.29(syst)±0.26(lumi)±0.17(beam) pb, with uncertainties due to data statistics, systematic effects, the knowledge of the integrated luminosity and the LHC beam energy, corresponding to a total relative uncertainty of 3.9% and an internal systematic uncertainty excluding the luminosity and the LHC beam energy of 2.5%. The breakdown of the systematic uncertainties is presented in Table 4. Overall, the analysis systematic uncertainties in the fiducial cross-section are smaller than those in the inclusive cross-section, due to the substantial reductions in the PDF and hadronisation uncertainties that contribute significantly to both the acceptance Aeμ and reconstruction efficiency Geμ.AcknowledgementsWe thank CERN for the very successful operation of the LHC, as well as the support staff from our institutions without whom ATLAS could not be operated efficiently.We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, the Canada Council, Canarie, CRC, Compute Canada, FQRNT, and the Ontario Innovation Trust, Canada; EPLANET, ERC, FP7, Horizon 2020 and Marie Skłodowska-Curie Actions, European Union; Investissements d'Avenir Labex and Idex, ANR, Région Auvergne and Fondation Partager le Savoir, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF; BSF, GIF and Minerva, Israel; BRF, Norway; Generalitat de Catalunya, Generalitat Valenciana, Spain; the Royal Society and Leverhulme Trust, United Kingdom.The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. 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