Self-interacting dark matter with a vector mediator: kinetic mixing with the $$ \mathrm{U}{(1)}_{{\left(B-L\right)}_3} $$ gauge boson

Abstract

A spontaneously broken hidden U(1) h gauge symmetry can explain both the dark matter stability and the observed relic abundance. In this framework, the light gauge boson can mediate the strong dark matter self-interaction, which addresses astrophysical observations that are hard to explain in collisionless cold dark matter. Motivated by flavoured grand unified theories, we introduce right-handed neutrinos and a flavoured B − L gauge symmetry for the third family U(1) (B−L) 3. The unwanted relic of the U(1) h gauge boson decays into neutrinos via the kinetic mixing with the U(1) (B−L) 3 gauge boson. Indirect detection bounds on dark matter are systematically weakened, since dark matter annihilation results in neutrinos. However, the kinetic mixing between U(1) (B−L) 3 and U(1) Y gauge bosons are induced by quantum corrections and leads to an observable signal in direct and indirect detection experiments of dark matter. This model can also explain the baryon asymmetry of the Universe via the thermal leptogenesis. In addition, we discuss the possibility of explaining the lepton flavour universality violation in semi-leptonic B meson decays that is recently found in the LHCb experiment.

Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

“…In addition to the electroweak gauge boson, photon, and gluon induced bound states, also the Higgs boson [44,45] can attractively contribute to confine DM into a meta-stable bound state. Self-interacting DM [46] with new light mediators [47][48][49][50][51][52][53][54][55][56][57][58], motivated from a bottom-up approach to alleviate the diversity problem in galactic rotation curves [59,60] or in certain cases even simultaneously ameliorate the Hubble tension [61,62], are further examples where long-range interactions can affect the dark matter relic abundance.…”

A heavy neutral gauge boson near the Z boson mass pole via third generation fermions at the LHC

“…We test the signal-plus-background prediction, µ i ≡ N i s+b (g t , m Z ), against the background prediction η i ≡ N i b in each bin i for g τ = 0.5 fixed. The log-likelihood is given by the Poisson model in Equation 6.…”

“…Due to the numerous allowed combinations of couplings to standard model (SM) fermions, however, there remain production and decay modes that are yet to be thoroughly explored. Of particular interest, in light of the flavor hierarchy in the SM, is a Z that couples preferentially to the third generation fermions [1][2][3][4][5][6][7].…”

Unification for darkly charged dark matter

“…The DM with a massive Uð1Þ 0 gauge boson is also considered in Refs. [17,21,[62][63][64][65][66][67][68][69][70][71]. Our SOð10Þ 0 gauge theory may also be a natural candidate for the UV theory of those models.…”