Observable lepton number violation with predominantly Dirac nature of active neutrinos

2016/09/30 by Debasish Borah, Arnab Dasgupta
Physics and Astronomy · #CP violation #Dark Matter and Cosmic Phenomena #Dirac (video compression format) #Lepton #Lepton number #MAJORANA #Majorana equation #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #Sterile neutrino #hep-ph

paper · pdf · doi:10.1007/jhep01(2017)072

33 pages, 16 figures, to appear in JHEP

openalex created_date 2016/09/23 · openalex publication_date 2017/01/01 · arxiv created 2017/01/10 · arxiv updated 2017/03/08 · openalex updated_date 2026/08/05

Abstract

We study a specific version of SU(2) R × SU(2) L × U(1) B−L models extended by discrete symmetries where the new physics sector responsible for tiny neutrino masses at leading order remains decoupled from the new physics sector that can give rise to observable signatures of lepton number violation such as neutrinoless double beta decay. More specifically, the dominant contribution to light neutrino masses comes from a one-loop Dirac mass. At higher loop level, a tiny Majorana mass also appears which remains suppressed by many order of magnitudes in comparison to the Dirac mass. Such a model where the active neutrinos are predominantly of Dirac type, also predicts observable charged lepton flavour violation like μ → 3e, μ → eγ and multi-component dark matter.

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