Majorana phases beyond neutrinoless double beta decay

2024/06/26 by Avital Dery, Stefania Gori, Dery, Avital +5
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research

paper · pdf · doi:10.48550/arxiv.2406.18647

openalex publication_date 2024/06/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/03

Abstract

The ν_M\rm SM is defined as the SM extended to include dimension-5 operators. In this model neutrino masses violate lepton number, and two parameters of the lepton mixing matrix, the Majorana phases, are yet to be constrained. One combination of these phases and the neutrino masses, often denoted by m_ee, is probed by neutrinoless double beta decays (0νββ). We explore what information may be obtained beyond 0νββ, and how it depends on the lightest neutrino mass. We point out that with current central values of the mixing parameters, ΔL_e=2 and ΔL_e=ΔL_μ= 1 (or ΔL_e=2 and ΔL_μ= 2) processes cannot simultaneously vanish, providing a no-lose theorem, in principle, for excluding the ν_M\rm SM, even in the case of normal mass ordering.

Related

• Analytically expressed constraint on two Majorana phases in neutrinoless double beta decay
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• Neutrinoless double beta decay rates and the 3 + 2 scenario
• The Neutrinoless Double Beta Decay, Physics beyond the Standard Model and the Neutrino Mass