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arXiv · 2606.09288

Global Ab initio Neutrino Mass Limits from Neutrinoless Double-Beta Decay

T. Shickele·L. Jokiniemi·A. Belley·J. D. Holt
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Abstract

We present global limits for Majorana neutrino masses by combining latest results from neutrinoless double-beta ($0\nu\beta\beta$) decay searches and ab initio nuclear theory. Limits are derived in a Bayesian framework utilizing likelihood functions from a suite of $0\nu\beta\beta$-decay experiments in conjunction with nuclear matrix elements calculated from nuclear and electroweak forces derived from chiral effective field theory and implemented in the in-medium similarity renormalization group many-body approach. In contrast to nuclear models, ab initio results indicate that the current generation of $0\nu\beta\beta$-decay experiments have likely \textit{not} yet reached sensitivities required to probe the mass regime allowed by neutrino-oscillation data, where the combined bounds are notably stronger than those given by individual experiments. Finally, from predicted sensitivities of next-generation searches, we show that, while no one individual experiment fully covers the inverted mass ordering, this can be achieved from combined contributions from the four key isotopes: $^{76}$Ge, $^{100}$Mo, $^{130}$Te, and $^{136}$Xe.

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T. Shickele, L. Jokiniemi, A. Belley, J. D. Holt. 2026-06-08. Global Ab initio Neutrino Mass Limits from Neutrinoless Double-Beta Decay. https://arxiv.org/abs/2606.09288

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