Marriage between neutrino mass and flavor anomalies

TL;DR

This paper proposes a unified model using scalar leptoquarks to simultaneously explain flavor anomalies in B-meson decays, muon and electron g-2 deviations, and the origin of neutrino mass, all within current experimental constraints.

Contribution

It introduces a two-loop neutrino mass generation mechanism involving leptoquarks that also resolve multiple flavor anomalies in a single framework.

Findings

Leptoquark model explains B-decay anomalies and g-2 deviations.

Neutrino mass generated at two-loop order within the model.

Model satisfies collider and flavor physics constraints.

Abstract

Experimental hints for lepton flavor universality violation in beauty-quark decay both in neutral- and charged-current transitions require an extension of the Standard Model for which scalar leptoquarks (LQs) are the prime candidates. Besides, these same LQs can resolve the long-standing tension in the muon and the recently reported deviation in the electron $g-2$ anomalies. These tantalizing flavor anomalies have discrepancies in the range of $2.5\sigma-4.2\sigma$, indicating that the Standard Model of particle physics may finally be cracking. In this Letter, we propose a resolution to all these anomalies within a unified framework that sheds light on the origin of neutrino mass. In this model, the LQs that address flavor anomalies run through the loops and generate neutrino mass at the two-loop order while satisfying all constraints from collider searches, including those from flavor physics.