Nonabelian dark matter with resonant annihilation

Abstract

We construct a model based on an extra gauge symmetry, SU(2) X ×U(1) B−L , which can provide gauge bosons to serve as weakly-interacting massive particle dark matter. The stability of the dark matter is naturally guaranteed by a discrete Z 2 symmetry that is a subgroup of SU(2) X . The dark matter interacts with standard model fermions by exchanging gauge bosons which are linear combinations of SU(2) X ×U(1) B−L gauge bosons. With the appropriate choice of representation for the new scalar multiplet whose vacuum expectation value spontaneously breaks the SU(2) X symmetry, the relation between the new gauge boson masses can naturally lead to resonant pair annihilation of the dark matter. After exploring the parameter space of the new gauge couplings subject to constraints from collider data and the observed relic density, we use the results to evaluate the cross section of the dark matter scattering off nucleons and compare it with data from the latest direct detection experiments. We find allowed parameter regions that can be probed by future direct searches for dark matter and LHC searches for new particles.

Explaining B→K(*)ℓ+ℓ−Ko1, Nomura2, Okada3 2017Phys. Rev. DSelf Cite611360View full textAdd to dashboardCite

“…where Λ is some heavy scale [32][33][34][35]; for example it can be heavy vector like quark with opposite U (1) µ−τ charge. For g ′ = 0.1 the size of mixing parameter is |ǫ| 10 −3 if Λ is not too large compared to M a .…”

Dark sector portal with vectorlike leptons and flavor sequestering

“…[1][2][3][4][5][6][7] and [8,9], though we will not focus on models like those in Refs. [8,9] where the dark gauge boson is itself the dark matter. We are interested here in a mechanism that allows the dark gauge boson to develop a small coupling to the visible sector, adequate enough to facilitate the annihilation of the dark matter for a successful thermal freeze-out, without running afoul of direct detection bounds.…”

SU(2)Xvector DM and Galactic Center gamma-ray excess

“…The interesting properties of a local SU(2) X group are: (1) comparing with the local U (1) case in which the U (1) charge has to satisfy some artificial tuning [56], an unbroken discrete symmetry can be naturally preserved after the spontaneous breaking of the SU(2) X gauge symmetry; (2) the massive gauge bosons from SU (2) symmetry have been studied in the literature, such as a remaining Z 2 symmetry with a quintet in Ref. [57], a custodial symmetry in Refs. [31,58] and an unbroken U (1) of SU (2) in Refs.…”