Self-interacting dark matter with a vector mediator: kinetic mixing with U(1)$_{(B-L)_3}$ gauge boson. (arXiv:1811.02567v1 [hep-ph])

Self-interacting dark matter with a vector mediator: kinetic mixing with U(1)$_{(B-L)_3}$ gauge boson. (arXiv:1811.02567v1 [hep-ph])
<a href="http://arxiv.org/find/hep-ph/1/au:+Kamada_A/0/1/0/all/0/1">Ayuki Kamada</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Yamada_M/0/1/0/all/0/1">Masaki Yamada</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Yanagida_T/0/1/0/all/0/1">Tsutomu T. Yanagida</a>

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. 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 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
lepton flavour universality violation in semi-leptonic $B$ meson decays that is
recently found in the LHCb experiment.

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. 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 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
lepton flavour universality violation in semi-leptonic $B$ meson decays that is
recently found in the LHCb experiment.

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