Light mass window of lepton portal dark matter. (arXiv:2011.04788v4 [hep-ph] UPDATED)
<a href="http://arxiv.org/find/hep-ph/1/au:+Okawa_S/0/1/0/all/0/1">Shohei Okawa</a>, <a href="http://arxiv.org/find/hep-ph/1/au:+Omura_Y/0/1/0/all/0/1">Yuji Omura</a>

We explore a novel possibility that dark matter has a light mass below 1GeV
in a lepton portal dark matter model. There are Yukawa couplings involving dark
matter, left-handed leptons and an extra scalar doublet in the model. In the
light mass region, dark matter is thermally produced via its annihilation into
neutrinos. In order to obtain the correct relic abundance and avoid collider
bounds, a neutral scalar is required to be light while charged scalars need to
be heavier than the electroweak scale. Such a mass spectrum is realized by
adjusting quartic couplings in the scalar potential or introducing an extra
singlet scalar. It turns out that the mass region of 10MeV-10GeV is almost free
from experimental and observational constraints. We also point out that
searches for extra neutrino flux from galactic dark matter annihilations with
neutrino telescopes are the best way to test our model.

We explore a novel possibility that dark matter has a light mass below 1GeV
in a lepton portal dark matter model. There are Yukawa couplings involving dark
matter, left-handed leptons and an extra scalar doublet in the model. In the
light mass region, dark matter is thermally produced via its annihilation into
neutrinos. In order to obtain the correct relic abundance and avoid collider
bounds, a neutral scalar is required to be light while charged scalars need to
be heavier than the electroweak scale. Such a mass spectrum is realized by
adjusting quartic couplings in the scalar potential or introducing an extra
singlet scalar. It turns out that the mass region of 10MeV-10GeV is almost free
from experimental and observational constraints. We also point out that
searches for extra neutrino flux from galactic dark matter annihilations with
neutrino telescopes are the best way to test our model.

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