Radiative neutrino mass models and the flavour anomalies

Abstract

A possible connection between the hints for lepton flavour non-universality in the B-decay observables RK(∗) and RD(∗) and radiative models for Majorana neutrino mass generation is discussed. After a brief survey of the anomalies, a systematic approach to radiative Majorana-mass model building using ∆L = 2 effective operators constructed out of standard model fields is reviewed. Then two specific models are examined: a minimal model containing the S1 ∼ (3,1,−1/3) scalar leptoquark, and a next-to-minimal model containing S1 and S3 ∼ (3,3,−1/3).