# Vector SIMP dark matter with approximate custodial symmetry

Abstract : We consider a novel scenario for Vector Strongly Interacting Massive Particle (VSIMP) dark matter with local $SU(2)_X\times U(1)_{Z'}$ symmetry in the dark sector. Similarly to the Standard Model, 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 $U(1)_{Z'}$-charged gauge boson of $SU(2)_X$ ($X_\pm$) becomes a natural candidate for SIMP dark matter, annihilating through $3\rightarrow 2$ or forbidden $2\rightarrow 2$ 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 Standard Model. 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.
Document type :
Journal articles
Domain :

https://hal.archives-ouvertes.fr/hal-02322303
Contributor : Yann Mambrini <>
Submitted on : Monday, October 21, 2019 - 3:45:08 PM
Last modification on : Wednesday, October 14, 2020 - 4:10:34 AM

### Citation

Soo-Min Choi, Hyun Min Lee, Yann Mambrini, Mathias Pierre. Vector SIMP dark matter with approximate custodial symmetry. Journal of High Energy Physics, Springer, 2019, 2019 (7), ⟨10.1007/JHEP07(2019)049⟩. ⟨hal-02322303⟩

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