Lepton flavor (universality) violation in $B$-meson decays

TL;DR

This paper proposes a new leptoquark model explaining observed deviations from lepton flavor universality in B-meson decays, consistent with LHCb data, and predicts testable bounds on related lepton flavor violating processes.

Contribution

Introduction of a novel leptoquark model that accounts for lepton flavor universality violation in B-meson decays via loop effects, aligning with experimental observations.

Findings

Model explains $R_K$ and $R_{K^*}$ anomalies

Predicts bounds on lepton flavor violating decays

Compatible with current LHCb results

Abstract

Even though the LHC searches did not unveil the new physics particles so far, LHCb hints towards deviations from lepton flavor universality in exclusive decays based on the transition $b\to s\ell\ell$. In this proceeding, we present a new leptoquark model that can explain both $R_{K}^{\mathrm{exp}}<R_{K}^{\mathrm{SM}}$ and $R_{K^\ast}^{\mathrm{exp}}<R_{K^\ast}^{\mathrm{SM}}$ via loop effects, consistent with observations made by LHCb. We discuss the main predictions of this scenario that can be tested experimentally, which include the bounds on lepton flavor violating decays $\mathcal{B}(Z\to\mu\tau) \lesssim \mathcal{O}(10^{-7})$ and $\mathcal{B}(B\to K\mu\tau)\lesssim \mathcal{O}(10^{-9})$.