MEDEX'25

Loop Effects in Probing Lepton Number Violation

Jun 23, 2025, 11:45 AM

30m

Conference room (Institute of Experimental and Applied Physics, CTU in Prague)

Oral presentation Theory Theory

Speaker

Lukas Graf (Nikhef/Charles University)

Description

The discovery of lepton number violation would be a clear sign of physics beyond the Standard Model, with neutrinoless double beta decay (0νββ) as its most sensitive probe. Within the SMEFT framework, we show that one-loop effects can significantly strengthen tree-level bounds on new-physics scales for several dimension-7 operators across flavours. Using UV model examples, we illustrate the interplay between 0νββ contributions from dimension-7 and loop-induced dimension-5 SMEFT operators.