Unified Scenario for Composite Right-Handed Neutrinos and Dark Matter

Abstract

We entertain the possibility that neutrino masses and dark matter (DM) originate from a common composite dark sector. A minimal effective theory can be constructed based on a dark $SU(3{)}_D$ interaction with three flavors of massless dark quarks; electroweak symmetry breaking gives masses to the dark quarks. By assigning a ${\mathbb{Z}}_2$ charge to one flavor, a stable "dark kaon" can provide a good thermal relic DM candidate. We find that "dark neutrons" may be identified as right handed Dirac neutrinos. Some level of "neutron-anti-neutron" oscillation in the dark sector can then result in non-zero Majorana masses for light Standard Model neutrinos. A simple ultraviolet completion is presented, involving additional heavy $SU(3{)}_D$-charged particles with electroweak and lepton Yukawa couplings. At our benchmark point, there are "dark pions" that are much lighter than the Higgs and we expect spectacular collider signals arising from the UV framework. This includes the decay of the Higgs boson to $\tau \tau \ell {\ell }^{\prime }$, where $\ell$(${\ell }^{\prime }$) can be any lepton, with displaced vertices. We discuss the observational signatures of this UV framework in dark matter searches and primordial gravitational wave experiments; the latter signature is potentially correlated with the $H\to \tau \tau \ell {\ell }^{\prime }$ decay.

8 pages, 4 figures, 1 table. Version published on PRD

References in corpus (5)

• Dark Matter Results From 54-Ton-Day Exposure of PandaX-II Experiment
• Gravitational Waves from Phase Transitions at the Electroweak Scale and Beyond
• Towards the glueball spectrum from unquenched lattice QCD
• Thermal Dark Matter from a Confining Sector
• Dark Matter and Neutrino Mass from the Smallest Non-Abelian Chiral Dark Sector

Cited by in corpus (1)

• Implications for First-Order Cosmological Phase Transitions from the Third LIGO-Virgo Observing Run