Two-loop Z4 Dirac neutrino masses and mixing, with self-interacting dark matter

Abstract

Choosing how gauge U (1) χ breaks in the context of SO(10) → SU (5) × U (1) χ , Z 4 lepton number may be obtained which maintains neutrinos as Dirac fermions. Choosing ∆(27) as the family symmetry of leptons, tree-level Dirac neutrino masses may be forbidden. Choosing a specific set of self-interactimg dark-matter particles, Dirac neutrino masses and mixing may then be generated in two loops. This framework allows the realization of cobimaximal neutrino mixing, i.e. θ 13 = 0, θ 23 = π/4, δ CP = ±π/2, as well as the desirable feature that the light scalar mediator of darkmatter interactions decays only to neutrinos, thereby not disrupting the cosmic microwave background (CMB).

Dirac neutrinos and dark matter stability from lepton quarticity

“…The scotogenic model is one such model where the 'dark sector' participates in the loop responsible for neutrino mass generation [94]. This work has been followed up in multiple ocasions over the last two decades, analyzing the phenomenology of the scotogenic model and variants of it in multiple dimensions as well as connecting the neutrino mass generation and dark matter with other new physics scenarios, both for Majorana and Dirac neutrinos [5,13,120,125,127,128,132,136,139,[166][167][168][169][170][171][172][173][174][175][176][177][178].…”

Dark Stars Powered by Self-Interacting Dark Matter

“…m φ m χ . If such a light mediator couples not only to the dark matter but also to standard model particles, strong constraints arise from direct and indirect detection experiments as well as from observations of the CMB [52][53][54][55][56][57][58][59][60][61]. As we will discuss in this section, the model we consider can simultaneously give rise to the observed dark matter relic density via thermal freeze-out, satisfy bounds from direct and indirect detection as well as the CMB, and, crucial for the possibility of a Dark Star, the energy from dark matter annihilation can be deposited in the baryonic gas in the environments where a Dark Star might form.…”

A non-renormalizable B-L model with Q 4 × Z 4 × Z 2 flavor symmetry for cobimaximal neutrino mixing

“…Non-Abelian discrete symmetries have shown many outstanding advantages in explaining the observed patterns of fermion masses and mixing, and have been widely used in literature. An observed lepton mixing scenario can be successfully described using the cobimaximal mixing pattern (a pattern that predicts and ), which has recently gained wider attention [22][23][24][25][26][27][28][29]. In order to explain the cobimaximal neutrino mixing pattern, alternative discrete symmetries have been used [22][23][24][25][26][27][28][29] with more than one Higgs doublet.…”