A Minimal Explanation of Flavour Anomalies: B-Meson Decays, Muon Magnetic Moment, and the Cabibbo Angle

TL;DR

This paper proposes a minimal New Physics framework involving two scalar mediators, a leptoquark and a charged singlet, to coherently explain multiple observed deviations from the Standard Model in B-meson decays, muon magnetic moment, and Cabibbo angle.

Contribution

It introduces a combined scalar mediator model that simultaneously addresses several flavor anomalies with minimal new physics components.

Findings

The model explains charged-current B-decays and muon magnetic moment anomalies.

It accounts for the Cabibbo-angle anomaly independently.

One-loop synergy of mediators addresses neutral-current B-decays.

Abstract

Significant deviations from the Standard Model are observed in semileptonic charged and neutral-current B-decays, the muon magnetic moment, and the extraction of the Cabibbo angle. We propose that these deviations point towards a coherent pattern of New Physics effects induced by two scalar mediators, a leptoquark $S_1$ and a charged singlet $\phi^+$. While $S_1$ can provide solutions to charged-current $B$-decays and the muon magnetic moment, and $\phi^+$ can accommodate the Cabibbo-angle anomaly independently, their one-loop level synergy can also address neutral-current $B$-decays. This framework provides the most minimal explanation to the above-mentioned anomalies, while being consistent with all other phenomenological constraints.