Leptoquark Option for $B$-meson Anomalies and Leptonic Signatures

TL;DR

This paper explores scalar leptoquarks as a unified explanation for B-meson decay anomalies, lepton g-2 discrepancies, and neutrino masses, proposing specific couplings and analyzing related experimental constraints.

Contribution

It introduces a model with scalar leptoquarks that simultaneously addresses B-meson anomalies, lepton g-2, and neutrino mass generation, with detailed correlation analysis.

Findings

Leptoquark couplings can explain R_K(*) and R_D(*) anomalies.

Leptoquark interactions predict observable lepton flavor violation.

Neutrino masses can be generated via top-quark loops in the model.

Abstract

We entertain the option of scalar leptoquarks to explain the anomalies in the semi-leptonic decays of $B$-mesons and the discrepancies in the lepton $(g-2)_l$'s including the recent results at Fermilab E989. The $R_{K^{(*)}}$ and $R_{D^{(*)}}$ anomalies can be accommodated by the specific couplings for triplet and singlet leptoquarks, respectively, subject to the bounds from $B\to K\nu{\bar\nu}$. We discuss the correlation between the leptonic signatures from leptoquarks such as $\mu\to e\gamma$ and the electric dipole moment of electron and show that desirable neutrino masses can be generated dominantly by top-quark loops in the extension of the model with several doublet leptoquarks.