14782 2007.11931 10.1007/JHEP02(2021)056 56 56 Composite Dark Matter and a horizontal symmetry Regular Article - Theoretical Physics 1 32 2021 2 8 2020 7 30 2020 12 14 2020 12 21 2021 2 8 The Author(s) 2021 Open Access. This article is distributed under the terms of the Creative Commons Attribution License ( CC-BY 4.0 ), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. 13130 2021 2021 2 2 Alexandre Carvunis carvunis@lapth.cnrs.fr Diego Guadagnoli diego.guadagnoli@lapth.cnrs.fr Méril Reboud meril.reboud@tum.de Peter Stangl stangl@itp.unibe.ch Laboratoire d’Annecy-le-Vieux de Physique Théorique UMR5108, Université de Savoie Mont-Blanc et CNRS B.P. 110 F-74941 Annecy Cedex France Abstract We present a model of composite Dark Matter (DM), in which a new QCD-like confining “hypercolor” sector generates naturally stable hyperbaryons as DM candidates and at the same time provides mass to new weakly coupled gauge bosons H that serve as DM mediators, coupling the hyperbaryons to the Standard Model (SM) fermions. By an appropriate choice of the H gauge symmetry as a horizontal SU(2) h SM flavor symmetry, we show how the H gauge bosons can be identified with the horizontal gauge bosons recently put forward as an explanation for discrepancies in rare B-meson decays. We find that the mass scale of the H gauge bosons suggested by the DM phenomenology intriguingly agrees with the one needed to explain the rare B-decay discrepancies. Keywords Beyond Standard Model Chiral Lagrangians Cosmology of Theories beyond the SM Technicolor and Composite Models ArXiv ePrint: 2007.11931