Neutrino astronomy as a probe of physics beyond the Standard Model: decay of sub-MeV $B$-$L$ gauge boson dark matter. (arXiv:2202.04496v2 [hep-ph] UPDATED)
<a href="http://arxiv.org/find/hep-ph/1/au:+Lin_W/0/1/0/all/0/1">Weikang Lin</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Visinelli_L/0/1/0/all/0/1">Luca Visinelli</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Xu_D/0/1/0/all/0/1">Donglian Xu</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Yanagida_T/0/1/0/all/0/1">Tsutomu T. Yanagida</a>
The $U(1)_{Btextrm{–}L}$ symmetry, the essential component in the seesaw
mechanism and leptogenesis, is naturally equipped with a massive gauge boson.
If this gauge boson is the dark matter, the scenario consistent with the seesaw
mechanism predicts the gauge coupling to be of the order of
$mathcal{O}(10^{-19})$ for masses $lesssim1$ MeV, dominantly decaying into
active neutrinos. We stress and explore the important role of astrophysical
neutrinos of energies from $mathcal{O}(1)$ keV to $sim1$ MeV in testing the
well-motivated $B$-$L$ symmetry extension to the Standard Model, which has been
missed in the literature to date. Compared to other dark matter models, the
neutrino flux in the sub-MeV energy range is a unique prediction in our setup
and, once detected, would serve as a smoking gun for the existence of this
$B$-$L$ gauge boson and its role as the dark matter particle, opening new
windows to tackle cosmological and astrophysical conundra.
The $U(1)_{Btextrm{–}L}$ symmetry, the essential component in the seesaw
mechanism and leptogenesis, is naturally equipped with a massive gauge boson.
If this gauge boson is the dark matter, the scenario consistent with the seesaw
mechanism predicts the gauge coupling to be of the order of
$mathcal{O}(10^{-19})$ for masses $lesssim1$ MeV, dominantly decaying into
active neutrinos. We stress and explore the important role of astrophysical
neutrinos of energies from $mathcal{O}(1)$ keV to $sim1$ MeV in testing the
well-motivated $B$-$L$ symmetry extension to the Standard Model, which has been
missed in the literature to date. Compared to other dark matter models, the
neutrino flux in the sub-MeV energy range is a unique prediction in our setup
and, once detected, would serve as a smoking gun for the existence of this
$B$-$L$ gauge boson and its role as the dark matter particle, opening new
windows to tackle cosmological and astrophysical conundra.
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