We provide a generic framework to obtain stable dark matter along with naturally small Dirac neutrino masses generated at the loop level. This is achieved through the spontaneous breaking of the global U(1)B−L symmetry already present in Standard Model. The U(1)B−L symmetry is broken down to a residual even Zn; n≥4 subgroup. The residual Zn symmetry simultaneously guarantees dark matter stability and protects the Dirac nature of neutrinos. The U(1)B−L symmetry in our setup is anomaly free and can also be gauged in a straightforward way. Finally, we present an explicit example using our framework to show the idea in action.
@article{arxiv.1812.01599,
title = {Dark matter stability and Dirac neutrinos using only Standard Model symmetries},
author = {Cesar Bonilla and Salvador Centelles Chuliá and Ricardo Cepedello and Eduardo Peinado and Rahul Srivastava},
journal= {arXiv preprint arXiv:1812.01599},
year = {2020}
}