PLB33937S0370-2693(18)30544-610.1016/j.physletb.2018.07.006ExperimentsFig. 1Simulated signal mℓℓbb distributions (closed circles) assuming mA = 500 GeV and mH = 250 GeV for the following cases: (a) the gluon–gluon fusion in the nb = 2 category and (b) b-associated production in the nb ≥ 3 category. Signal parameterisations are overlaid for comparison. The solid curves are from parameter values obtained directly from the fits to the simulated distributions, whereas the dashed curves use the interpolated parameter values. The differences between the simulation and the interpolated shape divided by the statistical uncertainties of the simulation are shown in the bottom panels. The distributions for the nb = 2 category of the b-associated production are similar to the nb ≥ 3 shape shown.Fig. 1Fig. 2The interpolated signal mℓℓbb distribution shapes assuming mA = 500 GeV and mH = 250 GeV and various A boson widths for the following cases: (a) gluon–gluon fusion in the nb = 2 category and (b) b-associated production in the nb ≥ 3 category. The distributions for the nb = 2 category of the b-associated production are similar to the nb ≥ 3 shape shown.Fig. 2Fig. 3The mℓℓbb mass distribution for the mbb window defined for mH = 200 GeV for (a) the nb = 2 and (b) the nb ≥ 3 category. The mbb distribution before any mbb window cuts is shown in (c) and (d) for the nb = 2 and the nb ≥ 3 categories, respectively. Signal distributions for mA = 700 GeV, mH = 200 GeV are also shown for gluon–gluon fusion production in (a, c) and b-associated production in (b, d) assuming production cross-sections times the branching ratios B(A→ZH) and B(H→bb) of 1 pb. The solid dots in the lower panels represent the ratio of the data to the post-fit background prediction, while the open circles are the ratio of the data to the pre-fit background prediction. In the mbb distributions in (c, d) the mbb window boundaries are also shown as vertical solid lines. The window efficiencies for the signals shown on the plots are about (77.4 ± 1.0)% for (c) and (58.3 ± 2.6)% for (d). The mℓℓbb distributions in (a) and (b) use variable bin widths. The last bin is used as a reference for normalisation, and its width is noted in the y-axis label. In this case, the content displayed in a bin is the number of events shown in that bin multiplied by the ratio of widths of the last bin relative to the bin shown.Fig. 3Fig. 4The mℓℓbb mass distribution for the mbb windows defined for mH = 300 GeV and mH = 500 GeV for (a, c) the nb = 2 and (b, d) the nb ≥ 3 category, respectively. Signal distributions are also shown for gluon–gluon fusion production in (a, c) and b-associated production in (b, d) assuming production cross-sections times the branching ratios B(A→ZH) and B(H→bb) of 1 pb. The same conventions as in Fig. 3 are used.Fig. 4Fig. 5Upper bounds at 95% CL on the production cross-section times the branching ratio B(A→ZH)×B(H→bb) in pb for (a, b) gluon–gluon fusion and (c, d) b-associated production. The expected upper limits are shown in (a) and (c) and the observed upper limits are shown in (b) and (d).Fig. 5Fig. 6Observed and expected 95% CL exclusion regions in the (mA, mH) plane for various tan⁡β values for (a) Type I, (b) Type II, (c) lepton specific and (d) flipped 2HDM.Fig. 6Table 1Summary of the event selection for signal and control regions.Table 1Single-electron or single-muon trigger Exactly 2 leptons (e or μ) (pT>7 GeV) with the leading one having pT>27 GeVOpposite electric charge for μμ or eμ pairs; 80GeV<mℓℓ,meμ<100GeV, ℓ=e,μAt least 2 b-jets (pT>20GeV) with one of them having pT>45GeV ETmiss/HT<3.5GeV1/2, ΣpT2/mℓℓbb>0.4nb = 2 categorynb ≥ 3 categoryExactly 2 b-tagged jetsAt least 3 b-tagged jetsSignal regionee or μμ pairee or μμ pair0.85 ⋅ mH − 20 GeV < mbb < mH + 20 GeV0.85 ⋅ mH − 25 GeV < mbb < mH + 50 GeVTop control regioneμ pair2leμ pair0.85 ⋅ mH − 20 GeV < mbb < mH + 20 GeV0.85 ⋅ mH − 25 GeV < mbb < mH + 50 GeVZ+jets control regionee or μμ pairee or μμ pairmbb < 0.85 ⋅ mH − 20 GeV or mbb > mH + 20 GeVmbb < 0.85 ⋅ mH − 25 GeV or mbb > mH + 50 GeVTable 2The effect of the most important sources of uncertainty on the signal-strength parameter at two example mass points of (mA,mH)=(230,130) GeV and (mA,mH)=(700,200) GeV for both the gluon–gluon fusion and b-associated production of a narrow-width A boson. The signal cross-sections are taken to be the expected median upper limits (see Section 8). JES and JER stand for jet energy scale and jet energy resolution, ‘Sim. stat.’ for simulation statistics, and ‘Bkg. model.’ for the background modelling.Table 2Gluon–gluon fusion productionb-Associated production(230,130) GeV(700,200) GeV(230,130) GeV(700,200) GeVSourceΔμ/μ [%]SourceΔμ/μ [%]SourceΔμ/μ [%]SourceΔμ/μ [%]Data stat.32Data stat.49Data stat.35Data stat.46Total syst.36Total syst.22Total syst.38Total syst.26Sim. stat.22Sim. stat.10Sim. stat.26Sim. stat.12Bkg. model.16Bkg. model.10b-tagging14Bkg. model.11JES/JER12Theory9.1JES/JER11b-tagging10b-tagging9.9b-tagging8.5Bkg. model.9.8Theory6.8Theory7.5Leptons4.2Theory7.0JES/JER6.2Search for a heavy Higgs boson decaying into a Z boson and another heavy Higgs boson in the ℓℓbb final state in pp collisions at s=13 TeV with the ATLAS detectorThe ATLAS Collaboration⋆M.Aaboud34dG.Aad99B.Abbott124O.Abdinov13⁎B.Abeloos128S.H.Abidi164O.S.AbouZeid143N.L.Abraham153H.Abramowicz158H.Abreu157Y.Abulaiti6B.S.Acharya67a67blS.Adachi160L.Adamczyk41aJ.Adelman119M.Adersberger112T.Adye140A.A.Affolder143Y.Afik157C.Agheorghiesei27cJ.A.Aguilar-Saavedra135f135aF.Ahmadov80aiG.Aielli74a74bS.Akatsuka83T.P.A.Åkesson95E.Akilli55A.V.Akimov108G.L.Alberghi23b23aJ.Albert174P.Albicocco52M.J.Alconada Verzini86S.Alderweireldt117M.Aleksa35I.N.Aleksandrov80C.Alexa27bG.Alexander158T.Alexopoulos10M.Alhroob124B.Ali137M.Aliev68a68bG.Alimonti69aJ.Alison36S.P.Alkire145C.Allaire128B.M.M.Allbrooke153B.W.Allen127P.P.Allport21A.Aloisio70a70bA.Alonso39F.Alonso86C.Alpigiani145A.A.Alshehri58M.I.Alstaty99B.Alvarez Gonzalez35D.Álvarez Piqueras172M.G.Alviggi70a70bB.T.Amadio18Y.Amaral Coutinho141aL.Ambroz131C.Amelung26D.Amidei103S.P.Amor Dos Santos135a135cS.Amoroso35C.S.Amrouche55C.Anastopoulos146L.S.Ancu55N.Andari21T.Andeen11C.F.Anders62bJ.K.Anders20K.J.Anderson36A.Andreazza69a69bV.Andrei62aS.Angelidakis37I.Angelozzi118A.Angerami38A.V.Anisenkov120b120aA.Annovi72aC.Antel62aM.T.Anthony146M.Antonelli52D.J.A.Antrim169F.Anulli73aM.Aoki81L.Aperio Bella35G.Arabidze104Y.Arai81J.P.Araque135aV.Araujo Ferraz141aR.Araujo Pereira141aA.T.H.Arce49R.E.Ardell91F.A.Arduh86J-F.Arguin107S.Argyropoulos78A.J.Armbruster35L.J.Armitage90O.Arnaez164H.Arnold118M.Arratia31O.Arslan24A.Artamonov109⁎G.Artoni131S.Artz97S.Asai160N.Asbah46A.Ashkenazi158E.M.Asimakopoulou170L.Asquith153K.Assamagan29R.Astalos28aR.J.Atkin32aM.Atkinson171N.B.Atlay148K.Augsten137G.Avolio35R.Avramidou61aB.Axen18M.K.Ayoub15aG.Azuelos107avA.E.Baas62aM.J.Baca21H.Bachacou142K.Bachas68a68bM.Backes131P.Bagnaia73a73bM.Bahmani42H.Bahrasemani149A.J.Bailey172J.T.Baines140M.Bajic39O.K.Baker181P.J.Bakker118D.Bakshi Gupta93E.M.Baldin120b120aP.Balek178F.Balli142W.K.Balunas132E.Banas42A.Bandyopadhyay24Sw.Banerjee179iA.A.E.Bannoura180L.Barak158W.M.Barbe37E.L.Barberio102D.Barberis56b56aM.Barbero99T.Barillari113M-SBarisits35J.Barkeloo127T.Barklow150N.Barlow31R.Barnea157S.L.Barnes61cB.M.Barnett140R.M.Barnett18Z.Barnovska-Blenessy61aA.Baroncelli75aG.Barone26A.J.Barr131L.Barranco Navarro172F.Barreiro96J.Barreiro Guimarães da Costa15aR.Bartoldus150A.E.Barton87P.Bartos28aA.Basalaev133A.Bassalat128R.L.Bates58S.J.Batista164S.Batlamous34eJ.R.Batley31M.Battaglia143M.Bauce73a73bF.Bauer142K.T.Bauer169H.S.Bawa150jJ.B.Beacham122M.D.Beattie87T.Beau94P.H.Beauchemin167P.Bechtle24H.C.Beck54H.P.Beck20rK.Becker53M.Becker97C.Becot121A.Beddall12dA.J.Beddall12aV.A.Bednyakov80M.Bedognetti118C.P.Bee152T.A.Beermann35M.Begalli141aM.Begel29A.Behera152J.K.Behr46A.S.Bell92G.Bella158L.Bellagamba23bA.Bellerive33M.Bellomo157K.Belotskiy110N.L.Belyaev110O.Benary158⁎D.Benchekroun34aM.Bender112N.Benekos10Y.Benhammou158E.Benhar Noccioli181J.Benitez78D.P.Benjamin49M.Benoit55J.R.Bensinger26S.Bentvelsen118L.Beresford131M.Beretta52D.Berge46E.Bergeaas Kuutmann170N.Berger5L.J.Bergsten26J.Beringer18S.Berlendis59N.R.Bernard100G.Bernardi94C.Bernius150F.U.Bernlochner24T.Berry91P.Berta97C.Bertella15aG.Bertoli45a45bI.A.Bertram87C.Bertsche46G.J.Besjes39O.Bessidskaia Bylund45a45bM.Bessner46N.Besson142A.Bethani98S.Bethke113A.Betti24A.J.Bevan90J.Beyer113R.M.Bianchi134O.Biebel112D.Biedermann19R.Bielski98K.Bierwagen97N.V.Biesuz72a72bM.Biglietti75aT.R.V.Billoud107M.Bindi54A.Bingul12dC.Bini73a73bS.Biondi23b23aT.Bisanz54C.Bittrich48D.M.Bjergaard49J.E.Black150K.M.Black25R.E.Blair6T.Blazek28aI.Bloch46C.Blocker26A.Blue58U.Blumenschein90Dr.Blunier144aG.J.Bobbink118V.S.Bobrovnikov120b120aS.S.Bocchetta95A.Bocci49C.Bock112D.Boerner180D.Bogavac112A.G.Bogdanchikov120b120aC.Bohm45aV.Boisvert91P.Bokan170aaT.Bold41aA.S.Boldyrev111A.E.Bolz62bM.Bomben94M.Bona90J.S.B.Bonilla127M.Boonekamp142A.Borisov139G.Borissov87J.Bortfeldt35D.Bortoletto131V.Bortolotto74a74bD.Boscherini23bM.Bosman14J.D.Bossio Sola30J.Boudreau134E.V.Bouhova-Thacker87D.Boumediene37C.Bourdarios128S.K.Boutle58A.Boveia122J.Boyd35I.R.Boyko80A.J.Bozson91J.Bracinik21N.Brahimi99A.Brandt8G.Brandt180O.Brandt62aF.Braren46U.Bratzler161B.Brau100J.E.Brau127W.D.Breaden Madden58K.Brendlinger46A.J.Brennan102L.Brenner46R.Brenner170S.Bressler178B.Brickwedde97D.L.Briglin21T.M.Bristow50D.Britton58D.Britzger62bI.Brock24R.Brock104G.Brooijmans38T.Brooks91W.K.Brooks144bE.Brost119J.HBroughton21P.A.Bruckman de Renstrom42D.Bruncko28bA.Bruni23bG.Bruni23bL.S.Bruni118S.Bruno74a74bB.H.Brunt31M.Bruschi23bN.Bruscino134P.Bryant36L.Bryngemark46T.Buanes17Q.Buat35P.Buchholz148A.G.Buckley58I.A.Budagov80F.Buehrer53M.K.Bugge130O.Bulekov110D.Bullock8T.J.Burch119S.Burdin88C.D.Burgard118A.M.Burger5B.Burghgrave119K.Burka42S.Burke140I.Burmeister47J.T.P.Burr131D.Büscher53V.Büscher97E.Buschmann54P.Bussey58J.M.Butler25C.M.Buttar58J.M.Butterworth92P.Butti35W.Buttinger35A.Buzatu155A.R.Buzykaev120b120aG.Cabras23b23aS.Cabrera Urbán172D.Caforio137H.Cai171V.M.M.Cairo2O.Cakir4aN.Calace55P.Calafiura18A.Calandri99G.Calderini94P.Calfayan66G.Callea40b40aL.P.Caloba141aS.Calvente Lopez96D.Calvet37S.Calvet37T.P.Calvet152M.Calvetti72a72bR.Camacho Toro36S.Camarda35P.Camarri74a74bD.Cameron130R.Caminal Armadans100C.Camincher59S.Campana35M.Campanelli92A.Camplani69a69bA.Campoverde148V.Canale70a70bM.Cano Bret61cJ.Cantero125T.Cao158Y.Cao171M.D.M.Capeans Garrido35I.Caprini27bM.Caprini27bM.Capua40b40aR.M.Carbone38R.Cardarelli74aF.Cardillo53I.Carli138T.Carli35G.Carlino70aB.T.Carlson134L.Carminati69a69bR.M.D.Carney45a45bS.Caron117E.Carquin144bS.Carrá69a69bG.D.Carrillo-Montoya35D.Casadei32bM.P.Casado14eA.F.Casha164M.Casolino14D.W.Casper169R.Castelijn118V.Castillo Gimenez172N.F.Castro135a135eA.Catinaccio35J.R.Catmore130A.Cattai35J.Caudron24V.Cavaliere29E.Cavallaro14D.Cavalli69aM.Cavalli-Sforza14V.Cavasinni72a72bE.Celebi12bF.Ceradini75a75bL.Cerda Alberich172A.S.Cerqueira141bA.Cerri153L.Cerrito74a74bF.Cerutti18A.Cervelli23b23aS.A.Cetin12bA.Chafaq34aDCChakraborty119S.K.Chan60W.S.Chan118W.Y.Chan88Y.L.Chan64aP.Chang171J.D.Chapman31D.G.Charlton21C.C.Chau33C.A.Chavez Barajas153S.Che122A.Chegwidden104S.Chekanov6S.V.Chekulaev165aG.A.Chelkov80auM.A.Chelstowska35C.Chen61aC.Chen79H.Chen29J.Chen61aJ.Chen38S.Chen15bS.Chen132X.Chen15catY.Chen82Y.-H.Chen46H.C.Cheng103H.J.Cheng15dA.Cheplakov80E.Cheremushkina139R.Cherkaoui El Moursli34eE.Cheu7K.Cheung65L.Chevalier142V.Chiarella52G.Chiarelli72aG.Chiodini68aA.S.Chisholm35A.Chitan27bI.Chiu160Y.H.Chiu174M.V.Chizhov80K.Choi66A.R.Chomont128S.Chouridou159Y.S.Chow118V.Christodoulou92M.C.Chu64aJ.Chudoba136A.J.Chuinard101J.J.Chwastowski42L.Chytka126D.Cinca47V.Cindro89I.A.Cioară24A.Ciocio18F.Cirotto70a70bZ.H.Citron178M.Citterio69aA.Clark55M.R.Clark38P.J.Clark50R.N.Clarke18C.Clement45a45bY.Coadou99M.Cobal67a67cA.Coccaro56b56aJ.Cochran79L.Colasurdo117B.Cole38A.P.Colijn118J.Collot59P.Conde Muiño135a135bE.Coniavitis53S.H.Connell32bI.A.Connelly98S.Constantinescu27bF.Conventi70aawA.M.Cooper-Sarkar131F.Cormier173K.J.R.Cormier164M.Corradi73a73bE.E.Corrigan95F.Corriveau101agA.Cortes-Gonzalez35M.J.Costa172D.Costanzo146G.Cottin31G.Cowan91B.E.Cox98J.Crane98K.Cranmer121S.J.Crawley58R.A.Creager132G.Cree33S.Crépé-Renaudin59F.Crescioli94M.Cristinziani24V.Croft121G.Crosetti40b40aA.Cueto96T.Cuhadar Donszelmann146A.R.Cukierman150M.Curatolo52J.Cúth97S.Czekierda42P.Czodrowski35M.J.Da Cunha Sargedas De Sousa61b135bC.Da Via98W.Dabrowski41aT.Dado28aaaS.Dahbi34eT.Dai103O.Dale17F.Dallaire107C.Dallapiccola100M.Dam39G.D'amen23b23aJ.R.Dandoy132M.F.Daneri30N.P.Dang179iN.DDann98M.Danninger173V.Dao35G.Darbo56bS.Darmora8O.Dartsi5A.Dattagupta127T.Daubney46S.D'Auria58W.Davey24C.David46T.Davidek138D.R.Davis49E.Dawe102I.Dawson146K.De8R.de Asmundis70aA.De Benedetti124S.De Castro23b23aS.De Cecco94N.De Groot117P.de Jong118H.De la Torre104F.De Lorenzi79A.De Maria54sD.De Pedis73aA.De Salvo73aU.De Sanctis74a74bA.De Santo153K.De Vasconcelos Corga99J.B.De Vivie De Regie128C.Debenedetti143D.V.Dedovich80N.Dehghanian3M.Del Gaudio40b40aJ.Del Peso96D.Delgove128F.Deliot142C.M.Delitzsch7M.Della Pietra70a70bD.della Volpe55A.Dell'Acqua35L.Dell'Asta25M.Delmastro5C.Delporte128P.A.Delsart59D.A.DeMarco164S.Demers181M.Demichev80S.P.Denisov139D.Denysiuk118L.D'Eramo94D.Derendarz42J.E.Derkaoui34dF.Derue94P.Dervan88K.Desch24C.Deterre46K.Dette164M.R.Devesa30P.O.Deviveiros35A.Dewhurst140S.Dhaliwal26F.A.Di Bello55A.Di Ciaccio74a74bL.Di Ciaccio5W.K.Di Clemente132C.Di Donato70a70bA.Di Girolamo35B.Di Micco75a75bR.Di Nardo35K.F.Di Petrillo60A.Di Simone53R.Di Sipio164D.Di Valentino33C.Diaconu99M.Diamond164F.A.Dias39T.Dias do Vale135aM.A.Diaz144aJ.Dickinson18E.B.Diehl103J.Dietrich19S.Díez Cornell46A.Dimitrievska18J.Dingfelder24F.Dittus35F.Djama99T.Djobava156bJ.I.Djuvsland62aM.A.B.do Vale141cM.Dobre27bD.Dodsworth26C.Doglioni95J.Dolejsi138Z.Dolezal138M.Donadelli141dJ.Donini37M.D'Onofrio88J.Dopke140A.Doria70aM.T.Dova86A.T.Doyle58E.Drechsler54E.Dreyer149T.Dreyer54M.Dris10Y.Du61bJ.Duarte-Campderros158F.Dubinin108A.Dubreuil55E.Duchovni178G.Duckeck112A.Ducourthial94O.A.Ducu107zD.Duda118A.Dudarev35A.Chr.Dudder97E.M.Duffield18L.Duflot128M.Dührssen35C.Dülsen180M.Dumancic178A.E.Dumitriu27bdA.K.Duncan58M.Dunford62aA.Duperrin99H.Duran Yildiz4aM.Düren57A.Durglishvili156bD.Duschinger48B.Dutta46D.Duvnjak1M.Dyndal46B.S.Dziedzic42C.Eckardt46K.M.Ecker113R.C.Edgar103T.Eifert35G.Eigen17K.Einsweiler18T.Ekelof170M.El Kacimi34cR.El Kosseifi99V.Ellajosyula99M.Ellert170F.Ellinghaus180A.A.Elliot174N.Ellis35J.Elmsheuser29M.Elsing35D.Emeliyanov140Y.Enari160J.S.Ennis176M.B.Epland49J.Erdmann47A.Ereditato20S.Errede171M.Escalier128C.Escobar172B.Esposito52O.Estrada Pastor172A.I.Etienvre142E.Etzion158H.Evans66A.Ezhilov133M.Ezzi34eF.Fabbri23b23aL.Fabbri23b23aV.Fabiani117G.Facini92R.M.Fakhrutdinov139S.Falciano73aP.J.Falke5S.Falke5J.Faltova138Y.Fang15aM.Fanti69a69bA.Farbin8A.Farilla75aE.M.Farina71a71bT.Farooque104S.Farrell18S.M.Farrington176P.Farthouat35F.Fassi34eP.Fassnacht35D.Fassouliotis9M.Faucci Giannelli50A.Favareto56b56aW.J.Fawcett55L.Fayard128O.L.Fedin133nW.Fedorko173M.Feickert43S.Feigl130L.Feligioni99C.Feng61bE.J.Feng35M.Feng49M.J.Fenton58A.B.Fenyuk139L.Feremenga8J.Ferrando46A.Ferrari170P.Ferrari118R.Ferrari71aD.E.Ferreira de Lima62bA.Ferrer172D.Ferrere55C.Ferretti103F.Fiedler97A.Filipčič89F.Filthaut117M.Fincke-Keeler174K.D.Finelli25M.C.N.Fiolhais135a135caL.Fiorini172C.Fischer14J.Fischer180W.C.Fisher104N.Flaschel46I.Fleck148P.Fleischmann103R.R.M.Fletcher132T.Flick180B.M.Flierl112L.M.Flores132L.R.Flores 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Pascual15aM.Garcia-Sciveres18R.W.Gardner36N.Garelli150V.Garonne130K.Gasnikova46A.Gaudiello56b56aG.Gaudio71aI.L.Gavrilenko108A.Gavrilyuk109C.Gay173G.Gaycken24E.N.Gazis10C.N.P.Gee140J.Geisen54M.Geisen97M.P.Geisler62aK.Gellerstedt45a45bC.Gemme56bM.H.Genest59C.Geng103S.Gentile73a73bC.Gentsos159S.George91D.Gerbaudo14G.Gessner47S.Ghasemi148M.Ghneimat24B.Giacobbe23bS.Giagu73a73bN.Giangiacomi23b23aP.Giannetti72aS.M.Gibson91M.Gignac143D.Gillberg33G.Gilles180D.M.Gingrich3avM.P.Giordani67a67cF.M.Giorgi23bP.F.Giraud142P.Giromini60G.Giugliarelli67a67cD.Giugni69aF.Giuli131M.Giulini62bS.Gkaitatzis159I.Gkialas9hE.L.Gkougkousis14P.Gkountoumis10L.K.Gladilin111C.Glasman96J.Glatzer14P.C.F.Glaysher46A.Glazov46M.Goblirsch-Kolb26J.Godlewski42S.Goldfarb102T.Golling55D.Golubkov139A.Gomes135a135b135dR.Gonçalo135aR.Goncalves Gama141bG.Gonella53L.Gonella21A.Gongadze80F.Gonnella21J.L.Gonski60S.González de la 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Vulpen118M.C.van Woerden118M.Vanadia74a74bW.Vandelli35A.Vaniachine163P.Vankov118R.Vari73aE.W.Varnes7C.Varni56b56aT.Varol43D.Varouchas128A.Vartapetian8K.E.Varvell154G.A.Vasquez144bJ.G.Vasquez181F.Vazeille37D.Vazquez Furelos14T.Vazquez Schroeder101J.Veatch54V.Vecchio75a75bL.M.Veloce164F.Veloso135a135cS.Veneziano73aA.Ventura68a68bM.Venturi174N.Venturi35V.Vercesi71aM.Verducci75a75bW.Verkerke118A.T.Vermeulen118J.C.Vermeulen118M.C.Vetterli149avN.Viaux Maira144bO.Viazlo95I.Vichou171⁎T.Vickey146O.E.Vickey Boeriu146G.H.A.Viehhauser131S.Viel18L.Vigani131M.Villa23b23aM.Villaplana Perez69a69bE.Vilucchi52M.G.Vincter33V.B.Vinogradov80A.Vishwakarma46C.Vittori23b23aI.Vivarelli153S.Vlachos10M.Vogel180P.Vokac137G.Volpi14S.E.von Buddenbrock32cE.von Toerne24V.Vorobel138K.Vorobev110M.Vos172J.H.Vossebeld88N.Vranjes16M.Vranjes Milosavljevic16V.Vrba137M.Vreeswijk118T.Šfiligoj89R.Vuillermet35I.Vukotic36T.Ženiš28aL.Živković16P.Wagner24W.Wagner180J.Wagner-Kuhr112H.Wahlberg86S.Wahrmund48K.Wakamiya82J.Walder87R.Walker112W.Walkowiak148V.Wallangen45a45bA.M.Wang60C.Wang61bdF.Wang179H.Wang18H.Wang3J.Wang154J.Wang62bP.Wang43Q.Wang124R.-J.Wang94R.Wang61aR.Wang6S.M.Wang155T.Wang38W.Wang155mW.Wang61aahY.Wang61aZ.Wang61cC.Wanotayaroj46A.Warburton101C.P.Ward31D.R.Wardrope92A.Washbrook50P.M.Watkins21A.T.Watson21M.F.Watson21G.Watts145S.Watts98B.M.Waugh92A.F.Webb11S.Webb97C.Weber181M.S.Weber20S.A.Weber33S.M.Weber62aJ.S.Webster6A.R.Weidberg131B.Weinert66J.Weingarten54M.Weirich97C.Weiser53P.S.Wells35T.Wenaus29T.Wengler35S.Wenig35N.Wermes24M.D.Werner79P.Werner35M.Wessels62aT.D.Weston20K.Whalen127N.L.Whallon145A.M.Wharton87A.S.White103A.White8M.J.White1R.White144bD.Whiteson169B.W.Whitmore87F.J.Wickens140W.Wiedenmann179M.Wielers140C.Wiglesworth39L.A.M.Wiik-Fuchs53A.Wildauer113F.Wilk98H.G.Wilkens35H.H.Williams132S.Williams31C.Willis104S.Willocq100J.A.Wilson21I.Wingerter-Seez5E.Winkels153F.Winklmeier127O.J.Winston153B.T.Winter24M.Wittgen150M.Wobisch93alA.Wolf97T.M.H.Wolf118R.Wolff99M.W.Wolter42H.Wolters135a135cV.W.S.Wong173N.L.Woods143S.D.Worm21B.K.Wosiek42K.W.Woźniak42K.Wraight58M.Wu36S.L.Wu179X.Wu55Y.Wu61aT.R.Wyatt98B.M.Wynne50S.Xella39Z.Xi103L.Xia15cD.Xu15aH.Xu61aL.Xu29T.Xu142W.Xu103B.Yabsley154S.Yacoob32aK.Yajima129D.P.Yallup92D.Yamaguchi162Y.Yamaguchi162A.Yamamoto81T.Yamanaka160F.Yamane82M.Yamatani160T.Yamazaki160Y.Yamazaki82Z.Yan25H.Yang61c61dH.Yang18S.Yang78Y.Yang160Y.Yang155Z.Yang17W-M.Yao18Y.C.Yap46Y.Yasu81E.Yatsenko5K.H.Yau Wong24J.Ye43S.Ye29I.Yeletskikh80E.Yigitbasi25E.Yildirim97K.Yorita177K.Yoshihara132C.J.S.Young35C.Young150J.Yu8J.Yu79X.Yue62aS.P.Y.Yuen24I.Yusuff31axB.Zabinski42G.Zacharis10R.Zaidan14A.M.Zaitsev139anN.Zakharchuk46J.Zalieckas17S.Zambito60D.Zanzi35C.Zeitnitz180G.Zemaityte131J.C.Zeng171Q.Zeng150O.Zenin139D.Zerwas128M.Zgubič131D.Zhang103D.Zhang61bF.Zhang179G.Zhang61aahH.Zhang15bJ.Zhang6L.Zhang53L.Zhang61aM.Zhang171P.Zhang15bR.Zhang61adR.Zhang24X.Zhang61bY.Zhang15dZ.Zhang128X.Zhao43Y.Zhao61bakZ.Zhao61aA.Zhemchugov80B.Zhou103C.Zhou179L.Zhou43M.Zhou15dM.Zhou152N.Zhou61cY.Zhou7C.G.Zhu61bH.Zhu61aH.Zhu15aJ.Zhu103Y.Zhu61aX.Zhuang15aK.Zhukov108V.Zhulanov120b120aA.Zibell175D.Zieminska66N.I.Zimine80S.Zimmermann53Z.Zinonos113M.Zinser97M.Ziolkowski148G.Zobernig179A.Zoccoli23b23aK.Zoch54T.G.Zorbas146R.Zou36M.zur Nedden19L.Zwalinski351Department of Physics, University of Adelaide, Adelaide, AustraliaDepartment of PhysicsUniversity of AdelaideAdelaideAustralia2Physics Department, SUNY Albany, Albany NY, United States of AmericaPhysics DepartmentSUNY AlbanyAlbanyNYUnited States of America3Department 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, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, FranceLAPPUniversité Grenoble AlpesUniversité Savoie Mont BlancCNRS/IN2P3AnnecyFrance6High Energy Physics Division, Argonne National Laboratory, Argonne IL, United States of AmericaHigh Energy Physics DivisionArgonne National LaboratoryArgonneILUnited States of America7Department of Physics, University of Arizona, Tucson AZ, United States of AmericaDepartment of PhysicsUniversity of ArizonaTucsonAZUnited States of America8Department of Physics, The University of Texas at Arlington, Arlington TX, United States of AmericaDepartment of PhysicsThe University of Texas at ArlingtonArlingtonTXUnited States of America9Physics Department, National and Kapodistrian University of Athens, Athens, GreecePhysics DepartmentNational and Kapodistrian University 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 States of AmericaDepartment of PhysicsThe University of Texas at AustinAustinTXUnited States of America12aBahcesehir University, Faculty of Engineering and Natural Sciences, Istanbul, TurkeyBahcesehir UniversityFaculty of Engineering and Natural SciencesIstanbulTurkey12bIstanbul Bilgi University, Faculty of Engineering and Natural Sciences, Istanbul, TurkeyIstanbul Bilgi UniversityFaculty of Engineering and Natural SciencesIstanbulTurkey12cDepartment of Physics, Bogazici University, Istanbul, TurkeyDepartment of PhysicsBogazici UniversityIstanbulTurkey12dDepartment of Physics Engineering, Gaziantep University, Gaziantep, TurkeyDepartment of Physics EngineeringGaziantep UniversityGaziantepTurkey13Institute of Physics, Azerbaijan Academy of Sciences, Baku, AzerbaijanInstitute of PhysicsAzerbaijan Academy of SciencesBakuAzerbaijan14Institut 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 TechnologyBarcelonaSpain15aInstitute of High Energy Physics, Chinese Academy of Sciences, Beijing, ChinaInstitute of High Energy PhysicsChinese Academy of SciencesBeijingChina15bDepartment of Physics, Nanjing University, Jiangsu, ChinaDepartment of PhysicsNanjing UniversityJiangsuChina15cPhysics Department, Tsinghua University, Beijing, ChinaPhysics DepartmentTsinghua UniversityBeijingChina15dUniversity of Chinese Academy of Science (UCAS), Beijing, ChinaUniversity of Chinese Academy of Science (UCAS)BeijingChina16Institute of Physics, University of Belgrade, Belgrade, SerbiaInstitute of PhysicsUniversity of BelgradeBelgradeSerbia17Department for Physics and Technology, University of Bergen, Bergen, NorwayDepartment for Physics and TechnologyUniversity of BergenBergenNorway18Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley CA, United States of AmericaPhysics DivisionLawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyCAUnited States of America19Department of Physics, Humboldt University, Berlin, GermanyDepartment of PhysicsHumboldt UniversityBerlinGermany20Albert 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 BernBernSwitzerland21School of Physics and Astronomy, University of Birmingham, Birmingham, United KingdomSchool of Physics and AstronomyUniversity of BirminghamBirminghamUnited Kingdom22Centro de Investigaciones, Universidad Antonio Narino, Bogota, ColombiaCentro de InvestigacionesUniversidad Antonio NarinoBogotaColombia23aDipartimento di Fisica e Astronomia, Università di Bologna, Bologna, ItalyDipartimento di Fisica e AstronomiaUniversità di BolognaBolognaItaly23bINFN Sezione di Bologna, ItalyINFNSezione di BolognaItaly24Physikalisches Institut, University of Bonn, Bonn, GermanyPhysikalisches InstitutUniversity of BonnBonnGermany25Department of Physics, Boston University, Boston MA, United States of AmericaDepartment of PhysicsBoston UniversityBostonMAUnited States of America26Department of Physics, Brandeis University, Waltham MA, United States of AmericaDepartment of PhysicsBrandeis UniversityWalthamMAUnited States of America27aTransilvania University of Brasov, Brasov, RomaniaTransilvania University of BrasovBrasovRomania27bHoria Hulubei National Institute of Physics and Nuclear Engineering, RomaniaHoria Hulubei National Institute of Physics and Nuclear EngineeringRomania27cDepartment of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, RomaniaDepartment of PhysicsAlexandru Ioan Cuza University of IasiIasiRomania27dNational 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 NapocaRomania27eUniversity Politehnica Bucharest, Bucharest, RomaniaUniversity Politehnica BucharestBucharestRomania27fWest University in Timisoara, Timisoara, RomaniaWest University in TimisoaraTimisoaraRomania28aFaculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak RepublicFaculty of Mathematics, Physics and InformaticsComenius UniversityBratislavaSlovak Republic28bDepartment 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 Republic29Physics Department, Brookhaven National Laboratory, Upton NY, United States of AmericaPhysics DepartmentBrookhaven National LaboratoryUptonNYUnited States of America30Departamento de Física, Universidad de Buenos Aires, Buenos Aires, ArgentinaDepartamento de FísicaUniversidad de Buenos AiresBuenos AiresArgentina31Cavendish Laboratory, University of Cambridge, Cambridge, United KingdomCavendish LaboratoryUniversity of CambridgeCambridgeUnited Kingdom32aDepartment of Physics, University of Cape Town, Cape Town, South AfricaDepartment of PhysicsUniversity of Cape TownCape TownSouth Africa32bDepartment of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South AfricaDepartment of Mechanical Engineering ScienceUniversity of JohannesburgJohannesburgSouth Africa32cSchool of Physics, University of the Witwatersrand, Johannesburg, South AfricaSchool of PhysicsUniversity of the WitwatersrandJohannesburgSouth Africa33Department of Physics, Carleton University, Ottawa ON, CanadaDepartment of PhysicsCarleton UniversityOttawaONCanada34aFaculté 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 IICasablancaMorocco34bCentre National de l'Energie des Sciences Techniques Nucleaires, Rabat, MoroccoCentre National de l'Energie des Sciences Techniques NucleairesRabatMorocco34cFaculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, MoroccoFaculté des Sciences SemlaliaUniversité Cadi AyyadLPHEAMarrakechMorocco34dFaculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, MoroccoFaculté des SciencesUniversité Mohamed PremierLPTPMOujdaMorocco34eFaculté des sciences, Université Mohammed V, Rabat, MoroccoFaculté des sciencesUniversité Mohammed VRabatMorocco35CERN, Geneva, SwitzerlandCERNGenevaSwitzerland36Enrico Fermi Institute, University of Chicago, Chicago IL, United States of AmericaEnrico Fermi InstituteUniversity of ChicagoChicagoILUnited States of America37LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, FranceLPCUniversité Clermont AuvergneCNRS/IN2P3Clermont-FerrandFrance38Nevis Laboratory, Columbia University, Irvington NY, United States of AmericaNevis LaboratoryColumbia UniversityIrvingtonNYUnited States of America39Niels Bohr Institute, University of Copenhagen, Kobenhavn, DenmarkNiels Bohr InstituteUniversity of CopenhagenKobenhavnDenmark40aDipartimento di Fisica, Università della Calabria, Rende, ItalyDipartimento di FisicaUniversità della CalabriaRendeItaly40bINFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, ItalyINFN Gruppo Collegato di CosenzaLaboratori Nazionali di FrascatiItaly41aAGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Krakow, PolandAGH University of Science and TechnologyFaculty of Physics and Applied Computer ScienceKrakowPoland41bMarian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, PolandMarian Smoluchowski Institute of PhysicsJagiellonian UniversityKrakowPoland42Institute of Nuclear Physics Polish Academy of Sciences, Krakow, PolandInstitute of Nuclear Physics Polish Academy of SciencesKrakowPoland43Physics Department, Southern Methodist University, Dallas TX, United States of AmericaPhysics DepartmentSouthern Methodist UniversityDallasTXUnited States of America44Physics Department, University of Texas at Dallas, Richardson TX, United States of AmericaPhysics DepartmentUniversity of Texas at DallasRichardsonTXUnited States of America45aDepartment of Physics, Stockholm University, SwedenDepartment of PhysicsStockholm UniversitySweden45bThe Oskar Klein Centre, Stockholm, SwedenThe Oskar Klein CentreStockholmSweden46DESY, Hamburg and Zeuthen, GermanyDESYHamburg and ZeuthenGermany47Lehrstuhl für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, GermanyLehrstuhl für Experimentelle Physik IVTechnische Universität DortmundDortmundGermany48Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, GermanyInstitut für Kern- und TeilchenphysikTechnische Universität DresdenDresdenGermany49Department of Physics, Duke University, Durham NC, United States of AmericaDepartment of PhysicsDuke UniversityDurhamNCUnited States of America50SUPA - School of Physics and Astronomy, University of Edinburgh, Edinburgh, United KingdomSUPA - School of Physics and AstronomyUniversity of EdinburghEdinburghUnited Kingdom51Centre 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)VilleurbanneFrance52INFN e Laboratori Nazionali di Frascati, Frascati, ItalyINFN e Laboratori Nazionali di FrascatiFrascatiItaly53Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, GermanyFakultät für Mathematik und PhysikAlbert-Ludwigs-UniversitätFreiburgGermany54II Physikalisches Institut, Georg-August-Universität, Göttingen, GermanyII Physikalisches InstitutGeorg-August-UniversitätGöttingenGermany55Departement de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, SwitzerlandDepartement de Physique Nucléaire et CorpusculaireUniversité de GenèveGenevaSwitzerland56aDipartimento di Fisica, Università di Genova, Genova, ItalyDipartimento di FisicaUniversità di GenovaGenovaItaly56bINFN Sezione di Genova, ItalyINFN Sezione di GenovaItaly57II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, GermanyII. Physikalisches InstitutJustus-Liebig-Universität GiessenGiessenGermany58SUPA - School of Physics and Astronomy, University of Glasgow, Glasgow, United KingdomSUPA - School of Physics and AstronomyUniversity of GlasgowGlasgowUnited Kingdom59LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, FranceLPSCUniversité Grenoble AlpesCNRS/IN2P3Grenoble INPGrenobleFrance60Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge MA, United States of AmericaLaboratory for Particle Physics and CosmologyHarvard UniversityCambridgeMAUnited States of America61aDepartment of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Anhui, ChinaDepartment of Modern Physics and State Key Laboratory of Particle Detection and ElectronicsUniversity of Science and Technology of ChinaAnhuiChina61bSchool of Physics, Shandong University, Shandong, ChinaSchool of PhysicsShandong UniversityShandongChina61cSchool of Physics and Astronomy, Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, ChinaSchool of Physics and AstronomyKey Laboratory for Particle Physics, Astrophysics and CosmologyMinistry of EducationShanghai Key Laboratory for Particle Physics and CosmologyShanghai Jiao Tong UniversityChina61dTsung-Dao Lee Institute, Shanghai, ChinaTsung-Dao Lee InstituteShanghaiChina62aKirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyKirchhoff-Institut für PhysikRuprecht-Karls-Universität HeidelbergHeidelbergGermany62bPhysikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, GermanyPhysikalisches InstitutRuprecht-Karls-Universität HeidelbergHeidelbergGermany63Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, JapanFaculty of Applied Information ScienceHiroshima Institute of TechnologyHiroshimaJapan64aDepartment of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, ChinaDepartment of PhysicsThe Chinese University of Hong KongShatin, N.T.Hong KongChina64bDepartment of Physics, The University of Hong Kong, Hong Kong, ChinaDepartment of PhysicsThe University of Hong KongHong KongChina64cDepartment of Physics and Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaDepartment of PhysicsInstitute for Advanced StudyThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina65Department of Physics, National Tsing Hua University, Hsinchu, TaiwanDepartment of PhysicsNational Tsing Hua UniversityHsinchuTaiwan66Department of Physics, Indiana University, Bloomington IN, United States of AmericaDepartment of PhysicsIndiana UniversityBloomingtonINUnited States of America67aINFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, ItalyINFN Gruppo Collegato di Udine, Sezione di TriesteUdineItaly67bICTP, Trieste, ItalyICTPTriesteItaly67cDipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, ItalyDipartimento di Chimica, Fisica e AmbienteUniversità di UdineUdineItaly68aINFN Sezione di Lecce, ItalyINFN Sezione di LecceItaly68bDipartimento di Matematica e Fisica, Università del Salento, Lecce, ItalyDipartimento di Matematica e FisicaUniversità del SalentoLecceItaly69aINFN Sezione di Milano, ItalyINFN Sezione di MilanoItaly69bDipartimento di Fisica, Università di Milano, Milano, ItalyDipartimento di FisicaUniversità di MilanoMilanoItaly70aINFN Sezione di Napoli, ItalyINFN Sezione di NapoliItaly70bDipartimento di Fisica, Università di Napoli, Napoli, ItalyDipartimento di FisicaUniversità di NapoliNapoliItaly71aINFN Sezione di Pavia, ItalyINFN Sezione di PaviaItaly71bDipartimento di Fisica, Università di Pavia, Pavia, ItalyDipartimento di FisicaUniversità di PaviaPaviaItaly72aINFN Sezione di Pisa, ItalyINFNSezione di PisaItaly72bDipartimento di Fisica E. Fermi, Università di Pisa, Pisa, ItalyDipartimento di Fisica E. FermiUniversità di PisaPisaItaly73aINFN Sezione di Roma, ItalyINFN Sezione di RomaItaly73bDipartimento di Fisica, Sapienza Università di Roma, Roma, ItalyDipartimento di FisicaSapienza Università di RomaRomaItaly74aINFN Sezione di Roma Tor Vergata, ItalyINFN Sezione di Roma Tor VergataItaly74bDipartimento di Fisica, Università di Roma Tor Vergata, Roma, ItalyDipartimento di FisicaUniversità di Roma Tor VergataRomaItaly75aINFN Sezione di Roma Tre, ItalyINFN Sezione di Roma TreItaly75bDipartimento di Matematica e Fisica, Università Roma Tre, Roma, ItalyDipartimento di Matematica e FisicaUniversità Roma TreRomaItaly76aINFN-TIFPA, ItalyINFN-TIFPAItaly76bUniversity of Trento, Trento, ItalyUniversity of TrentoTrentoItaly77Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, AustriaInstitut für Astro- und TeilchenphysikLeopold-Franzens-UniversitätInnsbruckAustria78University of Iowa, Iowa City IA, United States of AmericaUniversity of IowaIowa CityIAUnited States of America79Department of Physics and Astronomy, Iowa State University, Ames IA, United States of AmericaDepartment of Physics and AstronomyIowa State UniversityAmesIAUnited States of America80Joint Institute for Nuclear Research, JINR Dubna, Dubna, RussiaJoint Institute for Nuclear ResearchJINR DubnaDubnaRussia81KEK, High Energy Accelerator Research Organization, Tsukuba, JapanKEKHigh Energy Accelerator Research OrganizationTsukubaJapan82Graduate School of Science, Kobe University, Kobe, JapanGraduate School of ScienceKobe UniversityKobeJapan83Faculty of Science, Kyoto University, Kyoto, JapanFaculty of ScienceKyoto UniversityKyotoJapan84Kyoto University of Education, Kyoto, JapanKyoto University of EducationKyotoJapan85Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka, JapanResearch Center for Advanced Particle PhysicsDepartment of PhysicsKyushu UniversityFukuokaJapan86Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, ArgentinaInstituto de Física La PlataUniversidad Nacional de La Plata and CONICETLa PlataArgentina87Physics Department, Lancaster University, Lancaster, United KingdomPhysics DepartmentLancaster UniversityLancasterUnited Kingdom88Oliver Lodge Laboratory, University of Liverpool, Liverpool, United KingdomOliver Lodge LaboratoryUniversity of LiverpoolLiverpoolUnited Kingdom89Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, SloveniaDepartment of Experimental Particle PhysicsJožef Stefan InstituteDepartment of PhysicsUniversity of LjubljanaLjubljanaSlovenia90School of Physics and Astronomy, Queen Mary University of London, London, United KingdomSchool of Physics and AstronomyQueen Mary University of LondonLondonUnited Kingdom91Department of Physics, Royal Holloway University of London, Surrey, United KingdomDepartment of PhysicsRoyal Holloway University of LondonSurreyUnited Kingdom92Department of Physics and Astronomy, University College London, London, United KingdomDepartment of Physics and AstronomyUniversity College LondonLondonUnited Kingdom93Louisiana Tech University, Ruston LA, United States of AmericaLouisiana Tech UniversityRustonLAUnited States of America94Laboratoire 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/IN2P3ParisFrance95Fysiska institutionen, Lunds universitet, Lund, SwedenFysiska institutionenLunds universitetLundSweden96Departamento de Fisica Teorica C-15 and CIAFF, Universidad Autonoma de Madrid, Madrid, SpainDepartamento de Fisica Teorica C-15CIAFFUniversidad Autonoma de MadridMadridSpain97Institut für Physik, Universität Mainz, Mainz, GermanyInstitut für PhysikUniversität MainzMainzGermany98School of Physics and Astronomy, University of Manchester, Manchester, United KingdomSchool of Physics and AstronomyUniversity of ManchesterManchesterUnited Kingdom99CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, FranceCPPMAix-Marseille UniversitéCNRS/IN2P3MarseilleFrance100Department of Physics, University of Massachusetts, Amherst MA, United States of AmericaDepartment of PhysicsUniversity of MassachusettsAmherstMAUnited States of America101Department of Physics, McGill University, Montreal QC, CanadaDepartment of PhysicsMcGill UniversityMontrealQCCanada102School of Physics, University of Melbourne, Victoria, AustraliaSchool of PhysicsUniversity of MelbourneVictoriaAustralia103Department of Physics, The University of Michigan, Ann Arbor MI, United States of AmericaDepartment of PhysicsThe University of MichiganAnn ArborMIUnited States of America104Department of Physics and Astronomy, Michigan State University, East Lansing MI, United States of AmericaDepartment of Physics and AstronomyMichigan State UniversityEast LansingMIUnited States of America105B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, BelarusB.I. Stepanov Institute of PhysicsNational Academy of Sciences of BelarusMinskBelarus106Research Institute for Nuclear Problems of Byelorussian State University, Minsk, BelarusResearch Institute for Nuclear Problems of Byelorussian State UniversityMinskBelarus107Group of Particle Physics, University of Montreal, Montreal QC, CanadaGroup of Particle PhysicsUniversity of MontrealMontrealQCCanada108P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, RussiaP.N. Lebedev Physical Institute of the Russian Academy of SciencesMoscowRussia109Institute for Theoretical and Experimental Physics (ITEP), Moscow, RussiaInstitute for Theoretical and Experimental Physics (ITEP)MoscowRussia110National Research Nuclear University MEPhI, Moscow, RussiaNational Research Nuclear University MEPhIMoscowRussia111D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, RussiaD.V. Skobeltsyn Institute of Nuclear Physics, M.V. LomonosovMoscow State UniversityMoscowRussia112Fakultät für Physik, Ludwig-Maximilians-Universität München, München, GermanyFakultät für PhysikLudwig-Maximilians-Universität MünchenMünchenGermany113Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, GermanyMax-Planck-Institut für Physik (Werner-Heisenberg-Institut)MünchenGermany114Nagasaki Institute of Applied Science, Nagasaki, JapanNagasaki Institute of Applied ScienceNagasakiJapan115Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, JapanGraduate School of ScienceKobayashi-Maskawa InstituteNagoya UniversityNagoyaJapan116Department of Physics and Astronomy, University of New Mexico, Albuquerque NM, United States of AmericaDepartment of Physics and AstronomyUniversity of New MexicoAlbuquerqueNMUnited States of America117Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, NetherlandsInstitute for Mathematics, Astrophysics and Particle PhysicsRadboud University Nijmegen/NikhefNijmegenNetherlands118Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, NetherlandsNikhef National Institute for Subatomic PhysicsUniversity of AmsterdamAmsterdamNetherlands119Department of Physics, Northern Illinois University, DeKalb IL, United States of AmericaDepartment of PhysicsNorthern Illinois UniversityDeKalbILUnited States of America120aBudker Institute of Nuclear Physics, SB RAS, Novosibirsk, RussiaBudker Institute of Nuclear PhysicsSB RASNovosibirskRussia120bNovosibirsk State University Novosibirsk, RussiaNovosibirsk State UniversityNovosibirskRussia121Department of Physics, New York University, New York NY, United States of AmericaDepartment of PhysicsNew York UniversityNew YorkNYUnited States of America122Ohio State University, Columbus OH, United States of AmericaOhio State UniversityColumbusOHUnited States of America123Faculty of Science, Okayama University, Okayama, JapanFaculty of ScienceOkayama UniversityOkayamaJapan124Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman OK, United States of AmericaHomer L. Dodge Department of Physics and AstronomyUniversity of OklahomaNormanOKUnited States of America125Department of Physics, Oklahoma State University, Stillwater OK, United States of AmericaDepartment of PhysicsOklahoma State UniversityStillwaterOKUnited States of America126Palacký University, RCPTM, Olomouc, Czech RepublicPalacký UniversityRCPTMOlomoucCzech Republic127Center for High Energy Physics, University of Oregon, Eugene OR, United States of AmericaCenter for High Energy PhysicsUniversity of OregonEugeneORUnited States of America128LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, FranceLALUniversité Paris-SudCNRS/IN2P3Université Paris-SaclayOrsayFrance129Graduate School of Science, Osaka University, Osaka, JapanGraduate School of ScienceOsaka UniversityOsakaJapan130Department of Physics, University of Oslo, Oslo, NorwayDepartment of PhysicsUniversity of OsloOsloNorway131Department of Physics, Oxford University, Oxford, United KingdomDepartment of PhysicsOxford UniversityOxfordUnited Kingdom132Department of Physics, University of Pennsylvania, Philadelphia PA, United States of AmericaDepartment of PhysicsUniversity of PennsylvaniaPhiladelphiaPAUnited States of America133Konstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”, PNPI, St. Petersburg, RussiaKonstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”PNPISt. PetersburgRussia134Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh PA, United States of AmericaDepartment of Physics and AstronomyUniversity of PittsburghPittsburghPAUnited States of America135aLaboratório de Instrumentação e Física Experimental de Partículas - LIP, Lisboa, PortugalLaboratório de Instrumentação e Física Experimental de Partículas - LIPLisboaPortugal135bFaculdade de Ciências, Universidade de Lisboa, Lisboa, PortugalFaculdade de CiênciasUniversidade de LisboaLisboaPortugal135cDepartment of Physics, University of Coimbra, Coimbra, PortugalDepartment of PhysicsUniversity of CoimbraCoimbraPortugal135dCentro de Física Nuclear da Universidade de Lisboa, Lisboa, PortugalCentro de Física Nuclear da Universidade de LisboaLisboaPortugal135eDepartamento de Fisica, Universidade do Minho, Braga, PortugalDepartamento de FisicaUniversidade do MinhoBragaPortugal135fDepartamento de Fisica Teorica y del Cosmos, Universidad de Granada, Granada (Spain), PortugalDepartamento de Fisica Teorica y del CosmosUniversidad de GranadaGranada (Spain)Portugal135gDep Fisica and CEFITEC of Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, Caparica, PortugalDep FisicaCEFITEC of Faculdade de Ciencias e TecnologiaUniversidade Nova de LisboaCaparicaPortugal136Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech RepublicInstitute of PhysicsAcademy of Sciences of the Czech RepublicPrahaCzech Republic137Czech Technical University in Prague, Praha, Czech RepublicCzech Technical University in PraguePrahaCzech Republic138Charles University, Faculty of Mathematics and Physics, Prague, Czech RepublicCharles UniversityFaculty of Mathematics and PhysicsPragueCzech Republic139State Research Center Institute for High Energy Physics (Protvino), NRC KI, RussiaState Research Center Institute for High Energy Physics (Protvino)NRC KIRussia140Particle Physics Department, Rutherford Appleton Laboratory, Didcot, United KingdomParticle Physics DepartmentRutherford Appleton LaboratoryDidcotUnited Kingdom141aUniversidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, BrazilUniversidade Federal do Rio De Janeiro COPPE/EE/IFRio de JaneiroBrazil141bElectrical Circuits Department, Federal University of Juiz de Fora (UFJF), Juiz de Fora, BrazilElectrical Circuits DepartmentFederal University of Juiz de Fora (UFJF)Juiz de ForaBrazil141cFederal University of Sao Joao del Rei (UFSJ), Sao Joao del Rei, BrazilFederal University of Sao Joao del Rei (UFSJ)Sao Joao del ReiBrazil141dInstituto de Fisica, Universidade de Sao Paulo, Sao Paulo, BrazilInstituto de FisicaUniversidade de Sao PauloSao PauloBrazil142Institut de Recherches sur les Lois Fondamentales de l'Univers, DSM/IRFU, CEA Saclay, Gif-sur-Yvette, FranceInstitut de Recherches sur les Lois Fondamentales de l'UniversDSM/IRFUCEA SaclayGif-sur-YvetteFrance143Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz CA, United States of AmericaSanta Cruz Institute for Particle PhysicsUniversity of California Santa CruzSanta CruzCAUnited States of America144aDepartamento de Física, Pontificia Universidad Católica de Chile, Santiago, ChileDepartamento de FísicaPontificia Universidad Católica de ChileSantiagoChile144bDepartamento de Física, Universidad Técnica Federico Santa María, Valparaíso, ChileDepartamento de FísicaUniversidad Técnica Federico Santa MaríaValparaísoChile145Department of Physics, University of Washington, Seattle WA, United States of AmericaDepartment of PhysicsUniversity of WashingtonSeattleWAUnited States of America146Department of Physics and Astronomy, University of Sheffield, Sheffield, United KingdomDepartment of Physics and AstronomyUniversity of SheffieldSheffieldUnited Kingdom147Department of Physics, Shinshu University, Nagano, JapanDepartment of PhysicsShinshu UniversityNaganoJapan148Department Physik, Universität Siegen, Siegen, GermanyDepartment PhysikUniversität SiegenSiegenGermany149Department of Physics, Simon Fraser University, Burnaby BC, CanadaDepartment of PhysicsSimon Fraser UniversityBurnabyBCCanada150SLAC National Accelerator Laboratory, Stanford CA, United States of AmericaSLAC National Accelerator LaboratoryStanfordCAUnited States of America151Physics Department, Royal Institute of Technology, Stockholm, SwedenPhysics DepartmentRoyal Institute of TechnologyStockholmSweden152Departments of Physics and Astronomy, Stony Brook University, Stony Brook NY, United States of AmericaDepartments of Physics and AstronomyStony Brook UniversityStony BrookNYUnited States of America153Department of Physics and Astronomy, University of Sussex, Brighton, United KingdomDepartment of Physics and AstronomyUniversity of SussexBrightonUnited Kingdom154School of Physics, University of Sydney, Sydney, AustraliaSchool of PhysicsUniversity of SydneySydneyAustralia155Institute of Physics, Academia Sinica, Taipei, TaiwanInstitute of PhysicsAcademia SinicaTaipeiTaiwan156aE. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, GeorgiaE. Andronikashvili Institute of PhysicsIv. Javakhishvili Tbilisi State UniversityTbilisiGeorgia156bHigh Energy Physics Institute, Tbilisi State University, Tbilisi, GeorgiaHigh Energy Physics InstituteTbilisi State UniversityTbilisiGeorgia157Department of Physics, Technion: Israel Institute of Technology, Haifa, IsraelDepartment of PhysicsTechnion: Israel Institute of TechnologyHaifaIsrael158Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, IsraelRaymond and Beverly Sackler School of Physics and AstronomyTel Aviv UniversityTel AvivIsrael159Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, GreeceDepartment of PhysicsAristotle University of ThessalonikiThessalonikiGreece160International Center for Elementary Particle Physics and Department of Physics, The University of Tokyo, Tokyo, JapanInternational Center for Elementary Particle PhysicsDepartment of PhysicsThe University of TokyoTokyoJapan161Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, JapanGraduate School of Science and TechnologyTokyo Metropolitan UniversityTokyoJapan162Department of Physics, Tokyo Institute of Technology, Tokyo, JapanDepartment of PhysicsTokyo Institute of TechnologyTokyoJapan163Tomsk State University, Tomsk, RussiaTomsk State UniversityTomskRussia164Department of Physics, University of Toronto, Toronto ON, CanadaDepartment of PhysicsUniversity of TorontoTorontoONCanada165aTRIUMF, Vancouver BC, CanadaTRIUMFVancouverBCCanada165bDepartment of Physics and Astronomy, York University, Toronto ON, CanadaDepartment of Physics and AstronomyYork UniversityTorontoONCanada166Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, JapanDivision of Physics and Tomonaga Center for the History of the UniverseFaculty of Pure and Applied SciencesUniversity of TsukubaTsukubaJapan167Department of Physics and Astronomy, Tufts University, Medford MA, United States of AmericaDepartment of Physics and AstronomyTufts UniversityMedfordMAUnited States of America168Academia Sinica Grid Computing, Institute of Physics, Academia Sinica, Taipei, TaiwanAcademia Sinica Grid ComputingInstitute of PhysicsAcademia SinicaTaipeiTaiwan169Department of Physics and Astronomy, University of California Irvine, Irvine CA, United States of AmericaDepartment of Physics and AstronomyUniversity of California IrvineIrvineCAUnited States of America170Department of Physics and Astronomy, University of Uppsala, Uppsala, SwedenDepartment of Physics and AstronomyUniversity of UppsalaUppsalaSweden171Department of Physics, University of Illinois, Urbana IL, United States of AmericaDepartment of PhysicsUniversity of IllinoisUrbanaILUnited States of America172Instituto de Fisica Corpuscular (IFIC), Centro Mixto Universidad de Valencia - CSIC, SpainInstituto de Fisica Corpuscular (IFIC)Centro MixtoUniversidad de Valencia - CSICSpain173Department of Physics, University of British Columbia, Vancouver BC, CanadaDepartment of PhysicsUniversity of British ColumbiaVancouverBCCanada174Department of Physics and Astronomy, University of Victoria, Victoria BC, CanadaDepartment of Physics and AstronomyUniversity of VictoriaVictoriaBCCanada175Fakultät für Physik und Astronomie, Julius-Maximilians-Universität, Würzburg, GermanyFakultät für Physik und AstronomieJulius-Maximilians-UniversitätWürzburgGermany176Department of Physics, University of Warwick, Coventry, United KingdomDepartment of PhysicsUniversity of WarwickCoventryUnited Kingdom177Waseda University, Tokyo, JapanWaseda UniversityTokyoJapan178Department of Particle Physics, The Weizmann Institute of Science, Rehovot, IsraelDepartment of Particle PhysicsThe Weizmann Institute of ScienceRehovotIsrael179Department of Physics, University of Wisconsin, Madison WI, United States of AmericaDepartment of PhysicsUniversity of WisconsinMadisonWIUnited States of America180Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, GermanyFakultät für Mathematik und NaturwissenschaftenFachgruppe PhysikBergische Universität WuppertalWuppertalGermany181Department of Physics, Yale University, New Haven CT, United States of AmericaDepartment of PhysicsYale UniversityNew HavenCTUnited States of America182Yerevan Physics Institute, Yerevan, ArmeniaYerevan Physics InstituteYerevanArmeniaaAlso at Borough of Manhattan Community College, City University of New York, New York City, United States of America.bAlso at Centre for High Performance Computing, CSIR Campus, Rosebank, Cape Town, South Africa.cAlso at CERN, Geneva, Switzerland.dAlso at CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.eAlso at Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain.fAlso at Departamento de Fisica Teorica y del Cosmos, Universidad de Granada, Granada (Spain), Spain.gAlso at Departement de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland.hAlso at Department of Financial and Management Engineering, University of the Aegean, Chios, Greece.iAlso at Department of Physics and Astronomy, University of Louisville, Louisville, KY, United States of America.jAlso at Department of Physics, California State University, Fresno CA, United States of America.kAlso at Department of Physics, California State University, Sacramento CA, United States of America.lAlso at Department of Physics, King's College London, London, United Kingdom.mAlso at Department of Physics, Nanjing University, Jiangsu, China.nAlso at Department of Physics, St. Petersburg State Polytechnical University, St. Petersburg, Russia.oAlso at Department of Physics, Stanford University, Stanford CA, United States of America.pAlso at Department of Physics, The University of Michigan, Ann Arbor MI, United States of America.qAlso at Department of Physics, The University of Texas at Austin, Austin TX, United States of America.rAlso at Department of Physics, University of Fribourg, Fribourg, Switzerland.sAlso at Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy.tAlso at Faculty of Physics, M.V.Lomonosov Moscow State University, Moscow, Russia.uAlso at Fakultät für Mathematik und Physik, Albert-Ludwigs-Universität, Freiburg, Germany.vAlso at Georgian Technical University (GTU), Tbilisi, Georgia.wAlso at Giresun University, Faculty of Engineering, Turkey.xAlso at Graduate School of Science, Osaka University, Osaka, Japan.yAlso at Hellenic Open University, Patras, Greece.zAlso at Horia Hulubei National Institute of Physics and Nuclear Engineering, Romania.aaAlso at II Physikalisches Institut, Georg-August-Universität, Göttingen, Germany.abAlso at Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain.acAlso at Institut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Barcelona, Spain.adAlso at Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, Netherlands.aeAlso at Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia, Bulgaria.afAlso at Institute for Particle and Nuclear Physics, Wigner Research Centre for Physics, Budapest, Hungary.agAlso at Institute of Particle Physics (IPP), Canada.ahAlso at Institute of Physics, Academia Sinica, Taipei, Taiwan.aiAlso at Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan.ajAlso at Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia.akAlso at LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.alAlso at Louisiana Tech University, Ruston LA, United States of America.amAlso at Manhattan College, New York NY, United States of America.anAlso at Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia.aoAlso at National Research Nuclear University MEPhI, Moscow, Russia.apAlso at Near East University, Nicosia, North Cyprus, Mersin 10, Turkey.aqAlso at Ochadai Academic Production, Ochanomizu University, Tokyo, Japan.arAlso at School of Physics, Sun Yat-sen University, Guangzhou, China.asAlso at The City College of New York, New York NY, United States of America.atAlso at The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing, China.auAlso at Tomsk State University, Tomsk, and Moscow Institute of Physics and Technology State University, Dolgoprudny, Russia.avAlso at TRIUMF, Vancouver BC, Canada.awAlso at Universita di Napoli Parthenope, Napoli, Italy.axAlso at University of Malaya, Department of Physics, Kuala Lumpur, Malaysia.⁎Deceased.⋆E-mail address: atlas.publications@cern.ch.Editor: W.-D. SchlatterAbstractA search for a heavy neutral Higgs boson, A, decaying into a Z boson and another heavy Higgs boson, H, is performed using a data sample corresponding to an integrated luminosity of 36.1 fb−1 from proton–proton collisions at s=13 TeV recorded in 2015 and 2016 by the ATLAS detector at the Large Hadron Collider. The search considers the Z boson decaying to electrons or muons and the H boson into a pair of b-quarks. No evidence for the production of an A boson is found. Considering each production process separately, the 95% confidence-level upper limits on the pp→A→ZH production cross-section times the branching ratio H→bb are in the range of 14–830 fb for the gluon–gluon fusion process and 26–570 fb for the b-associated process for the mass ranges 130–700 GeV of the H boson and 230–800 GeV of the A boson. The results are interpreted in the context of two-Higgs-doublet models.1IntroductionAfter the discovery of a Higgs boson at the Large Hadron Collider (LHC) [1,2], one of the most important remaining questions is whether the recently discovered particle is part of an extended scalar sector or not. Additional Higgs bosons appear in all models with an extended scalar sector, such as the two-Higgs-doublet model (2HDM) [3,4]. Such extensions are motivated by, and included in, several new physics scenarios, such as supersymmetry [5], dark matter [6] and axion [7] models, electroweak baryogenesis [8] and neutrino mass models [9].The addition of a second Higgs doublet leads to five Higgs bosons after electroweak symmetry breaking. The phenomenology of such a model is very rich and depends on many parameters, such as the ratio of the vacuum expectation values of the two Higgs doublets (tan⁡β), and the Yukawa couplings of the scalar sector [4]. When CP conservation is assumed, the model contains two CP-even Higgs bosons, h and H with mH>mh, one CP-odd, A, and two charged scalars, H±. There have been many searches for the heavy neutral Higgs bosons of the 2HDM at the LHC, including H→WW/ZZ [10–13], A/H→ττ/bb [14–16], A→Zh [17,18] and H→hh [19,20]. For the interpretation of these searches it is usually assumed that the heavy Higgs bosons, H and A, are degenerate in mass, i.e. mA=mH.This assumption of mass degeneracy is relaxed in this Letter by assuming mA>mH. Such a case is motivated by electroweak baryogenesis scenarios in the context of the 2HDM [21–24]. For 2HDM electroweak baryogenesis to occur, the requirement mA>mH is favoured [21] for a strong first-order phase transition to take place in the early universe. The A boson mass is also bounded from above to be less than approximately 800 GeV, whereas the lighter CP-even Higgs boson, h, is required to have properties similar to those of a Standard Model (SM) Higgs boson and is assumed to be the Higgs boson with mass of 125 GeV that was discovered at the LHC [21]. Under such conditions and for large parts of the 2HDM parameter space, the CP-odd Higgs boson, A, decays into ZH [25,21]. The production of the A boson in the relevant 2HDM parameter space proceeds mainly through gluon–gluon fusion and b-associated production at the LHC.This search for A→ZH decays uses proton–proton collision data at s=13 TeV corresponding to an integrated luminosity of 36.1 fb−1 recorded by the ATLAS detector at the LHC. The search considers only Z→ℓℓ, where ℓ=e,μ, to take advantage of the clean leptonic final state, and H→bb, because of its large branching ratio. This final state allows full reconstruction of the A boson's decay kinematics. The reconstruction of the A boson's invariant mass uses the assumed value of the mass of the H boson to improve its resolution. The final state is also categorised by the presence of two or three b-tagged jets to take advantage of the b-associated production mechanism. The CMS Collaboration has published a similar search at s=8 TeV [26]. This Letter reports the result of a search at s=13 TeV, which extends the previous search by considering explicitly the gluon–gluon fusion and b-associated production processes as well as both narrow and wide widths of the A boson.2ATLAS detectorThe ATLAS detector is a general-purpose particle detector, described in detail in Ref. [27]. It includes an inner detector surrounded by a 2 T superconducting solenoid, electromagnetic and hadronic calorimeters and a muon spectrometer with a toroidal magnetic field. The inner detector consists of a high-granularity silicon pixel detector, including the insertable B-layer [28] installed in 2014, a silicon microstrip detector, and a straw-tube tracker. It provides precision tracking of charged particles with pseudorapidity |η|<2.5.11ATLAS 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 upward. Cylindrical coordinates (r, ϕ) are used in the transverse plane, ϕ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar angle, θ, as η=−ln⁡tan⁡(θ/2). Transverse momenta are computed from the three-momenta, p→, as pT=|p→|sin⁡θ. The calorimeter system covers the pseudorapidity range |η|<4.9. It is composed of sampling calorimeters with either liquid argon or scintillator tiles as the active medium. The muon spectrometer provides muon identification and measurement for |η|<2.7. A two-level trigger system [29] is employed to select events for offline analysis, which reduced the average recorded collision rate to about 1 kHz.3Data and simulationThe data used in this search were collected during 2015 and 2016 from s=13TeV proton–proton collisions and correspond to an integrated luminosity of 36.1 fb−1, which includes only data-taking periods where all relevant detector subsystems were operational. The data sample was collected using a set of single-muon and single-electron triggers. The lowest-pT trigger thresholds depend on the data-taking period and are in the range of 20–26 GeV for the single-muon triggers and 24–26 GeV for the single-electron triggers.Simulated signal events with A bosons produced by gluon–gluon fusion were generated at leading order with MadGraph5_aMC@NLO 2.3.3 [30,31] using Pythia 8.210 [32] with a set of tuned parameters called the A14 tune [33] for parton showering. For the generation of A bosons produced in association with b-quarks, MadGraph5_aMC@NLO 2.1.2 [31,34,35] was used following Ref. [36] together with Pythia 8.212 and the A14 tune for parton showering. The gluon–gluon fusion production used NNPDF2.3LO [37] as the parton distribution functions (PDF), while the b-associated production used CT10nlo_nf4 [38]. The signal samples were generated for A bosons with masses in the range of 230–800 GeV and widths up to 20% of the mass and for narrow-width H bosons with masses in the range of 130–700 GeV.Background events from the production of W and Z bosons in association with jets were simulated with Sherpa 2.2.1 [39] using the NNPDF3.0NNLO PDF set [40]. Top-quark-pair production was simulated with Powheg-Box v2 [41–43] and the CT10nlo PDF set [38], while the electroweak single-top-quark production was simulated with Powheg-Box v1 and the fixed four-flavour PDF set CT10nlo_f4 [38]. The parton shower was performed with Pythia 6.428 [44] using the Perugia 2012 set of tuned parameters [45]. The production of top-quark pairs in association with a vector boson was simulated using MadGraph5_aMC@NLO 2.2.3 and the NNPDF3.0NLO PDF set, whereas Pythia 8.186 was used for the parton shower with the A14 tune. Production of WW, ZZ and WZ pairs was simulated using Sherpa 2.2.1 and the NNPDF3.0NNLO PDF set. Finally, SM Higgs boson production in association with a Z boson was generated with Powheg-Box v2 and the NNPDF3.0NLO PDF set, whereas the parton shower was performed with Pythia 8.186 using the AZNLO tune [46].The modelling of bottom- and charm-hadron decays was performed with the EvtGen v1.2.0 package [47] for all samples apart from those simulated with Sherpa . The simulated events were overlaid with inelastic proton–proton collisions to account for the effect of multiple interactions occurring in the same and neighbouring bunch crossings (‘pile-up’). These events were generated using Pythia 8 with the A2 tune [48] and the MSTW2008LO PDF set [49]. The events were reweighted so that the distribution of the average number of interactions per bunch crossing agreed with the data.All generated background samples were passed through the Geant 4-based [50] detector simulation [51] of the ATLAS detector. The ATLFAST2 simulation [51] was used for the signal samples to allow for the generation of many different A and H boson masses. The simulated events were reconstructed in the same way as the data.4Object reconstructionElectrons are reconstructed from energy clusters in the electromagnetic calorimeter that are matched to tracks in the inner detector [52]. Electrons are required to have |η|<2.47 and pT>7GeV. To distinguish electrons from jets, isolation and quality requirements are applied [53]. The isolation requirements (the ‘LooseTrackOnly’ working point) are defined by the pT of tracks within cones around the electron with a size that decreases as a function of the transverse energy. The quality requirements (the ‘Loose’ working point) refer to both the inner detector track and the calorimeter shower shape. The efficiency for an electron to be reconstructed and meet these criteria is about 85% for electron pT>7GeV and increases to about 90% for pT>27GeV.Muons are reconstructed by matching tracks reconstructed in the inner detector to tracks or track segments in the muon spectrometer [54]. Muons used for this search must have |η|<2.5 and pT>7GeV, and are required to satisfy ‘LooseTrackOnly’ isolation requirements, similar to those used for electrons, as well as inner detector and muon spectrometer track ‘Loose’ quality criteria, corresponding to an efficiency of about 97%.Jets are reconstructed using the anti-kt algorithm [55,56] with radius parameter R=0.4 from clusters of energy deposits in the calorimeter system [57]. Candidate jets are required to have pT>20GeV (pT>30GeV) for |η|<2.5 (2.5<|η|<4.5). Low-pT jets from pile-up are rejected by a multivariate algorithm that uses properties of the reconstructed tracks in the event [58].Jets containing b-hadrons are selected using a multivariate tagging algorithm (b-tagging) [59,60]. The energy of the tagged jet (b-jet) is corrected for the average energy loss from semileptonic decays of b-hadrons and out-of-jet-cone tracks with large impact parameters [61]. The b-tagging efficiency for the jet pT range used in this analysis is between 65% and 75%. Applying the b-tagging algorithm reduces the number of light-flavour (c-quark) jets by a factor of 250–550 (10–20), depending on the jet kinematics.When electrons, muons and jets are spatially close, these algorithms can lead to ambiguous identifications. An overlap removal procedure [61] is therefore applied to uniquely identify these objects.The missing transverse momentum, ETmiss, is computed using reconstructed and calibrated leptons, photons and jets [62]. Tracks from the primary vertex22The primary vertex is taken to be the reconstructed vertex with the highest ΣpT2 of the associated tracks. which are not associated with any identified lepton or jet are also taken into account in the ETmiss reconstruction [63].5Event selectionThe decay A→ZH→ℓℓbb features a pair of oppositely charged, same flavour leptons and two b-jets. Three resonances can be formed by combining the selected objects: the Z boson (ℓℓ), the H boson (bb) and the A boson (ℓℓbb). Moreover, additional b-jets may be present if the A boson is produced via the b-associated production mechanism. These features are used to define the event selection as summarised in Table 1.The events recorded by the single-muon and the single-electron triggers are required to contain exactly two muons or two electrons, respectively. At least one of the leptons must have pT>27 GeV. Only events that contain a primary vertex with at least two associated tracks with pT>400MeV [64] are considered. In the case of muons, they are required to have opposite electric charges. No such requirement is applied to electrons due to their non-negligible charge misidentification rates resulting from conversions of bremsstrahlung photons. The invariant mass of the lepton pair, mℓℓ, must be in the range of 80–100 GeV to be compatible with the mass of the Z boson.The H→bb decay is reconstructed by requiring at least two b-jets with the highest-pT one having pT>45GeV. When more than two b-jets are present, the two highest-pT b-jets are considered to be from the H decay. Requiring b-jets increases the fraction of top-quark background in the signal region, including top-quark pair and single-top-quark production. This is reduced by requiring ETmiss/HT<3.5GeV1/2, where HT is the scalar sum of the pT of all jets and leptons in the event. In addition, a requirement that reduces the Z+jets background is also applied: ΣpT2/mℓℓbb>0.4, where mℓℓbb is the four-body invariant mass of the two-lepton, two-b-jet system assigned to the A boson and the summation is performed over the pT of these objects.Subsequently, two categories are defined: the nb=2 category, which contains events with exactly two b-jets, and the nb≥3 category, which contains events with three or more b-jets. For the gluon–gluon fusion production, 94%–97% of the events passing the above selection fall into the nb=2 category, depending on the assumed mA and mH. However for the b-associated production, 27%–36% fall into the nb≥3 category. The remaining b-associated produced signal events are categorised as nb=2 events, even though more than two b-jets are expected, due to the relatively soft pT spectrum of the associated b-jets and the geometric acceptance of the tracker.Finally, the invariant mass of the two leading b-jets, mbb, must be compatible with the assumed H boson mass by satisfying the requirement of 0.85⋅mH−20GeV<mbb<mH+20GeV for the nb=2 category, and 0.85⋅mH−25GeV<mbb<mH+50GeV for the nb≥3 category. The wider window for nb≥3 is motivated by a slightly degraded resolution due to potential b-jet mis-assignments (see later). The overall signal efficiency of the nb=2 category after this requirement is 5%–11% (3%–7%) for gluon–gluon fusion (b-associated production), depending on the mA and mH values. Similarly, the efficiency of the nb≥3 category is 2%–4% for the b-associated production. The signal region selection is summarised in Table 1.The mℓℓbb distribution after the mbb requirement is used to discriminate between signal and background. To improve the mℓℓbb resolution, the bb system's four-momentum components are scaled to match the assumed H boson mass and the ℓℓ system's four-momentum components are scaled to match the Z boson mass. This procedure, performed after the event selection, improves the mℓℓbb resolution by a factor of two without significantly distorting the background distributions, resulting in an A boson mass resolution of 0.3%–4%.The dominant backgrounds after these selections are from Z+jets and top-quark production. For top-quark-pair production, a very pure (>99% of predicted events) control region is used to determine the normalisation of the background, whereas its shape in the signal region is taken from the simulation. This control region is defined by keeping the same selection as discussed previously, apart from an opposite-flavour lepton criterion, i.e., an opposite-charge eμ pair is required instead of an ee or μμ pair (see also Table 1). The shape of the Z+jets background distribution is obtained from simulation and the normalisation is extracted from data together with the signal (see also Section 7). This procedure is possible because of the very different shapes of the mℓℓbb distributions from signal and Z+jets events. The normalisation of the Z+jets production is further constrained by a control region defined by inverting the mbb window criterion for each H boson mass hypothesis (see also Table 1). The control regions are distinct for the nb=2 and the nb≥3 categories, since the accuracy of the background simulation depends on the number of b-jets present in the event. Backgrounds from diboson, single top, and Higgs boson production, as well as top-quark-pair production in association with a vector boson, give a typical contribution of ∼5% to the total background. Their shapes are taken from simulation, whereas they are normalised using precise inclusive cross-sections calculated from theory. The diboson samples are normalised using next-to-next-to-leading-order (NNLO) cross-sections [65–68]. Single-top-quark production and top-quark-pair production in association with vector bosons are normalised to next-to-leading-order (NLO) cross-sections from Refs. [69–71] and Ref. [31], respectively. The normalisation of the Higgs boson production in association with a vector boson follows the recommendations of Ref. [36] using NNLO QCD and NLO electroweak corrections.6Signal modellingThe good mℓℓbb mass resolution together with the fact that theory models often predict A bosons with large widths inflates the number of signal mass and width hypotheses that need to be considered. For this reason, the mℓℓbb distributions are taken from simulation of a limited number of (mA,mH) mass points and an interpolation using analytical functions is employed for the rest.The mℓℓbb distributions for A bosons produced by gluon–gluon fusion and with negligible widths compared with the experimental resolution are found to be adequately described by the ExpGaussExp (EGE) function [72]:fEGE(m;a,σ,kL,kH)={e12kL2+kL(m−aσ)e−12(m−aσ)2e12kH2−kH(m−aσ)for{m−aσ≤−kL−kL<m−aσ≤kHm−aσ>kHOn the other hand, mℓℓbb distributions for A bosons from b-associated production, also with negligible widths compared with the experimental resolution, are better described by a double-Gaussian Crystal Ball (DSCB) function [73]:fDSCB(m;a,σ,kL,kH,n1,n2)={g(m;a,−σ,kL,n1)⋅e−12kL2e−12(m−aσ)2g(m;a,σ,kH,n2)⋅e12kH2for{m−aσ≤−kL−kL<m−aσ≤kHm−aσ>kH where g(m;a,σ,k,n)=[(|k|/n)(n/|k|−|k|+(m−a)/σ)]−n. Both functions consist of a Gaussian core with mean a and variance σ2, whereas the rest of the parameters (kL, kH, n1, n2) describe the tails. The DSCB function describes better than the EGEE function the slightly longer tails of the mass distribution of the b-associated production compared to gluon–gluon fusion. This is due to the few cases in which the b-quark produced in association with the Higgs boson is taken to be one of the b-quarks from the Higgs boson decay. The values of the function parameters are extracted from unbinned maximum-likelihood fits to the simulated mℓℓbb distributions. The core mean, a, is parameterised using a linear function of mA. The core width, σ, is observed to monotonically increase with Δm≡mA−mH and is parameterised with a third-degree polynomial. The rest of the parameters are largely constant and are fixed to their average values from the fits, with the exception of mass points with Δm=100GeV. The distributions at mass points with Δm=100GeV correspond to the smallest mass splitting considered in this search and are close to the kinematic cutoff. Their non-core parameters are fixed to the average fit values obtained from signal samples with this mass splitting only. As an example of the performance of this procedure, Fig. 1 shows a comparison for the (mA,mH)=(500,250) GeV mass point between the simulated distributions and the parametric functions described previously. The cores of the mℓℓbb distributions are well-parameterised by the chosen functional forms. The small differences seen in the tails of some distributions between the functional forms and the simulations have only negligible effects on the final results, and moreover they are included as a source of systematic uncertainty.The previously described parameterisation applies to signal samples generated with narrow-width A bosons. In some regions of 2HDM parameter space relevant to this analysis, the A boson's width is significant compared with the detector resolution while the H boson's width remains negligible. In order to model the mℓℓbb shape of A bosons with large natural widths, a modified Breit–Wigner distribution33The modification is the multiplication of the Breit–Wigner distribution with a log-normal distribution to account for the distortion due to the event selection. is convolved with the EGE and DSCB functions. The procedure is validated by comparing the results of the convolution with those of the simulated samples of A bosons with large natural widths. Widths of up to 20% of the A boson mass are considered. An example of signal distributions with large natural widths is shown in Fig. 2 for the same signal points used in Fig. 1.Finally, the signal efficiencies for the interpolated mass points are obtained through separate two-dimensional interpolations on the (mA,mH) plane using thin plate splines [74].7Fit model and systematic uncertaintiesThe mℓℓbb distribution is expected to exhibit a resonant structure if signal events are present, while background events result in a smooth shape. Therefore mℓℓbb is chosen as the final signal and background discriminating variable. The shape differences in the mℓℓbb distribution between the signal and background contributions are exploited through binned maximum-likelihood fits of the signal-plus-background hypotheses to extract potential signal contributions. The fits are based on the statistical framework described in Refs. [75–77]. For a given mass hypothesis of (mA,mH), the likelihood is constructed as the product of Poisson statistics in mℓℓbb bins:L(μ,α→,θ→|mA,mH)=∏i=binsPoisson(Ni|(μ×Si(mA,mH,θ→)+Bi(α→,θ→)))⋅G(θ→). Here Ni is the number of observed events and Si(mA,mH,θ→) and Bi(α→,θ→) are the expected number of signal and estimated background events in bin i. The vector α→ represents free background normalisation scale factors (described later) and vector θ→ denotes all non-explicitly listed parameters of the likelihood function such as nuisance parameters associated with systematic uncertainties. The function G(θ→) represents constraints on θ→. The parameter of interest, μ, is a multiplicative factor to the expected signal rate and is called the signal-strength parameter. The mℓℓbb bin widths are chosen according to the expected detector resolution and taking into account the statistical uncertainty related to the number of background Monte Carlo events. The bin centres are adjusted such that at least 68% of the test signal is contained in one bin. Only the nb=2 category is considered for the gluon–gluon fusion production while both the nb=2 and nb≥3 categories are included in the likelihood calculation for the b-associated production.For each bin, Si is calculated from the total integrated luminosity, the theoretical cross-section for the signal and its selection efficiency. The sum of all background contributions in the bin, Bi, is estimated from simulation. However, the tt¯ and Z+jets control regions are included in the likelihood calculation as one bin each, to help constrain their respective contributions in the signal regions. This is achieved by introducing two free normalisation scale factors, represented by α→, for each category for the two most relevant background contributions: one for tt¯ and the other for the heavy-flavour component (Z+h.f.) of the Z+jets contribution. These scale factors are applied to their respective contributions estimated from the simulations and their values are determined from the fit. Typical values of scale factors are close to unity. Taking (mA,mH)=(700,200) GeV as an example, the Z+h.f. scale factor is 1.12±0.09 for the nb=2 category and 1.1±0.2 for the nb≥3 category. Similarly, the tt¯ scale factors are 0.96±0.06 and 1.2±0.2 for the two corresponding categories.Systematic uncertainties are incorporated in the likelihood as nuisance parameters with either Gaussian or log-normal constraint terms. They include both the experimental and theoretical sources of uncertainty. Experimental uncertainties comprise those in the luminosity measurement, trigger, object identification, energy/momentum scale and resolution as well as underlying event and pile-up modelling. These uncertainties, discussed in Refs. [61,10], impact the simulations of signal and background processes. Theoretical uncertainties include both the signal and background modelling. For the signal modelling, uncertainties due to the factorisation and renormalisation scale choice, the initial- and final-state radiation treatment and the PDF choice are considered. Additional systematic uncertainties are assigned to cover the differences in signal efficiencies and mℓℓbb parameter values between the interpolations and the simulations. For the background modelling, the most important sources of systematic uncertainty are from the modelling of the mbb and the pTℓℓ distributions of Z+jets. They are taken to be the difference between the data and simulation of the selected samples before the event categorisation and the mbb requirement. The samples are dominated by the Z+jets contribution, and any potential signal contamination is expected to be negligible. For other background processes, they are obtained by varying the factorisation and renormalisation scales, the amount of initial- and final-state radiation, and the choices of PDF parameterisations.The effect of these systematic uncertainties on the search is studied using the signal-strength parameter μ for hypothesised signal production. Uncertainties having the largest impact depend on the choice of (mA,mH) signal point. Table 2 shows the relative uncertainties in the best-fit μ value from the leading sources of systematic uncertainty for two example mass points of both gluon–gluon fusion and b-associated production of a narrow-width A boson. The leading sources of systematic uncertainty are similar for other mass points studied and for larger A boson widths. For all cases, the limited size of the simulated samples has the largest impact on the search sensitivity among all the sources of systematic uncertainty. While systematic uncertainties and the statistical uncertainty of the data have comparable impact at low masses, the search sensitivity is mostly determined at high masses by the limited size of the data sample.8ResultsThe mℓℓbb distributions from different mbb mass windows are scanned for potential excesses beyond the background expectations through signal-plus-background fits. The scan is performed in steps of 10 GeV for both the mA range 230–800 GeV and the mH range 130–700 GeV, such that mA−mH≥100GeV. The step sizes are chosen to be compatible with the detector resolution for mℓℓbb and mbb.Fig. 3 shows the mℓℓbb distributions in the nb=2 and nb≥3 categories for the mbb window defined for mH=200GeV. The mbb distributions before any mbb window cut are also shown in this figure. The mℓℓbb distributions for two other mbb windows, defined for mH=300GeV and mH=500GeV are shown in Fig. 4. In all cases, the data are found to be well described by the background model. The most significant excess for the gluon–gluon fusion production signal assumption is at the (mA,mH)=(750,610) GeV signal point, for which the local (global) significance [78] is 3.5 (2.0) standard deviations. For the b-associated production, the most significant excess is at the (mA,mH)=(510,130) GeV signal point, for which the local (global) significance is 3.0 (1.2) standard deviations. The significances are calculated for each production process separately ignoring the contribution from the other.In the absence of a statistically significant excess, constraints on the production of A→ZH followed by the H→bb decay are derived. The method of Ref. [79] is used to calculate 95% confidence level (CL) upper bounds on the product of cross-section and decay branching ratios, σ×B(A→ZH)×B(H→bb), using the asymptotic approximation [77]. The upper limits are shown in Fig. 5 for a narrow-width A boson produced via gluon–gluon fusion and b-associated production. As for the significance calculations above, these limits are derived separately for each production process. For the gluon–gluon fusion limits, only the nb=2 category is used. For the b-associated production, both the nb=2 and nb≥3 categories are used. The upper limit for gluon–gluon fusion varies from 14 fb for the (mA,mH)= (800, 140) GeV signal point to 830 fb for the (mA,mH)= (240, 130) GeV signal point. This is to be compared with the corresponding expected limits of 24.1 fb and 469 fb for these two signal points. For the b-associated production the upper limits vary from 26 fb for the (mA,mH)= (780, 680) GeV signal point to 830 fb for the (mA,mH)= (240, 130) GeV signal point with expected limits of 46 fb and 360 fb, respectively.The results of the search are interpreted in the context of the 2HDM. For this interpretation, several assumptions are made to reduce the number of free parameters in the model. The charged Higgs boson is assumed to have the same mass as the A boson. The 2HDM parameter m122 is fixed to mA2tan⁡β/(1+tan2⁡β). The lightest Higgs boson of the model, h, is assumed to have a mass of 125GeV and its couplings are set to be the same as those of the SM Higgs boson, by choosing cos⁡(β−α)=0. The widths of the A and H bosons are taken from the predictions of the 2HDM. The cross-sections for A boson production in the 2HDM are calculated using up to NNLO QCD corrections for gluon–gluon fusion and b-associated production in the five-flavour scheme as implemented in SusHi [80–83]. For b-associated production a cross-section in the four-flavour scheme is also calculated as described in Refs. [84,85] and the results are combined with the five-flavour scheme calculation following Ref. [86]. The Higgs boson widths and branching ratios are calculated using 2HDMC [87]. The procedure for the calculation of the cross-sections and branching ratios, as well as for the choice of 2HDM parameters, follows Ref. [36].Since both gluon–gluon fusion and b-associated production are expected, a new signal model weighted by the predicted cross sections of the two processes is built for every point tested in the 2HDM parameter space. Upper limits on σ×B(A→ZH)×B(H→bb) with σ here including contributions from both processes are recalculated and compared with the 2HDM predictions to derive the limits in the 2HDM parameter space. Fig. 6 shows the observed and expected limits for Type I, Type II, ‘lepton specific’ and ‘flipped’ 2HDMs in the (mA, mH) plane for various tan⁡β values. Type-II and flipped show similar constraints because in these models the Yukawa couplings are the same for all fermions apart from leptons. The same holds when comparing Type-I and lepton-specific 2HDM, where the main reason for the difference in sensitivity is the increased significance of the H→ττ decay in the lepton-specific model. The gluon–gluon fusion production cross section decreases with increasing tan⁡β, which explains the loss of sensitivity in Type-I and lepton specific for large tan⁡β values. In the case of Type-II and flipped, at large tan⁡β values it is the b-associated production that dominates instead of the gluon–gluon fusion in this region. For instance the exclusion can reach up to mH≈ 400 GeV at lower tan⁡β (less than 10) and mH≈ 600 GeV at higher tan⁡β (more than 20). At low tan⁡β values the Higgs boson branching fraction to tt¯ becomes sizable, and this is what limits the sensitivity to below mH≈350 GeV in all models examined here.9ConclusionData recorded by the ATLAS experiment at the LHC, corresponding to an integrated luminosity of 36.1 fb−1 from proton–proton collisions at a centre-of-mass energy 13 TeV, are used to search for a heavy Higgs boson, A, decaying into ZH, where H denotes a heavy Higgs boson with mass mH>125GeV. The A boson is assumed to be produced via either gluon–gluon fusion or b-associated production. No significant deviation from the SM background predictions are observed in the ZH→ℓℓbb final state that is considered in this search. Considering each production process separately, upper limits are set at the 95% confidence level for σ×B(A→ZH)×B(H→bb) of 14–830 fb for gluon–gluon fusion and 26–570 fb for b-associated production of a narrow A boson for the mass ranges 130–700 GeV of the H boson and 230–800 GeV of the A boson. Taking into account both production processes, this search tightens the constraints on the 2HDM in the case of large mass splittings between its heavier neutral Higgs bosons.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-DRF/IRFU, France; SRNSFG, 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; 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, ERDF, 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; CERCA Programme 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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