Importance of Loop Effects in Probing Lepton Number Violation

2025/03/31 by Lukáš Gráf, Chandan Hati, Gráf, Lukáš +5 · 2 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Noncommutative and Quantum Gravity Theories

paper · pdf · doi:10.48550/arxiv.2504.00081

Abstract

The discovery of the lepton number violation would be a smoking gun signal for physics beyond the Standard Model, and its most sensitive probe is the search for neutrinoless double beta decay (0νββ). Working in the framework of the Standard Model Effective Field Theory (SMEFT), we show that one-loop effects can remarkably improve the tree-level bounds on the new-physics scales for several dimension-7 operators across different flavours. Using ultraviolet model examples, we then showcase the competition among 0νββ contributions induced by dimension-7 and loop-level dimension-5 SMEFT operators.

Citations

• Analysis of light neutrino exchange and short-range mechanisms in0νββdecay

Cited by

• Matching from quark to hadronic operators: external source vs spurion methods
• RGE solver for the complete dim-7 SMEFT interactions and its application to 0νββ decay

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