Vector SIMP dark matter with approximate custodial symmetry

Choi, Soo-Min (0000 0001 0789 9563, grid.254224.7, Department of Physics, Chung-Ang University, Seoul, 06974, Korea) ; Lee, Hyun (0000 0001 0789 9563, grid.254224.7, Department of Physics, Chung-Ang University, Seoul, 06974, Korea) (0000 0004 0610 5612, grid.249961.1, School of Physics, Korea Institute for Advanced Study, Seoul, 02455, Korea) ; Mambrini, Yann (0000 0001 2171 2558, grid.5842.b, Laboratoire de Physique Théorique (UMR8627), CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay, France) ; Pierre, Mathias (0000 0004 0561 6576, grid.501798.2, Instituto de Física Teórica (IFT) UAM-CSIC, Campus de Cantoblanco, 28049, Madrid, Spain) (0000000119578126, grid.5515.4, Departamento de Física Teórica, Universidad Autónoma de Madrid (UAM), Campus de Cantoblanco, 28049, Madrid, Spain)

11 July 2019

Abstract: We consider a novel scenario for Vector Strongly Interacting Massive Particle (VSIMP) dark matter with local SU(2) X × U(1) Z ′ symmetry in the dark sector. Similarly to the Standard Model (SM), after the dark symmetry is broken spontaneously by the VEVs of dark Higgs fields, the approximate custodial symmetry determines comparable but split masses for SU(2) X gauge bosons. In this model, we show that the U(1) Z ′ -charged gauge boson of SU(2) X ( X ± ) becomes a natural candidate for SIMP dark matter, annihilating through 3 → 2 or forbidden 2 → 2 annihilations due to gauge self-interactions. On the other hand, the U(1) Z ′ -neutral gauge boson of SU(2) X achieves the kinetic equilibrium of dark matter through a gauge kinetic mixing between U(1) Z ′ and SM hypercharge. We present the parameter space for the correct relic density in our model and discuss in detail the current constraints and projections from colliders and direct detection experiments.


Published in: JHEP 1907 (2019) 049 DOI: 10.1007/JHEP07(2019)049
arXiv: 1904.04109
License: CC-BY-4.0



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