Gauge leptoquark as the origin of B-physics anomalies

TL;DR

This paper introduces a UV-complete gauge model with a vector leptoquark that explains B-physics anomalies, consistent with existing experimental constraints and featuring a new TeV-scale gauge symmetry.

Contribution

It provides the first fully UV-complete, calculable gauge model for the vector leptoquark addressing B-physics anomalies, compatible with flavor and electroweak data.

Findings

Model remains consistent with flavor and electroweak constraints.

Suppresses flavor violation in $ riangle F=2$ processes.

Induces significant semileptonic transitions.

Abstract

The vector leptoquark representation, $U_\mu = (3,1,2/3)$, was recently identified as an exceptional single mediator model to address experimental hints on lepton flavour universality violation in semileptonic $B$-meson decays, both in neutral ($b \to s \mu \mu$) and charged ($b \to c \tau \nu$) current processes. Nonetheless, it is well-known that massive vectors crave an ultraviolet (UV) completion. We present the first full-fledged UV complete and calculable gauge model which incorporates this scenario while remaining in agreement with all other indirect flavour and electroweak precision measurements, as well as, direct searches at high-$p_T$. The model is based on a new non-abelian gauge group spontaneously broken at the TeV scale, and a specific flavour structure suppressing flavour violation in $\Delta F = 2$ processes while inducing sizeable semileptonic transitions.