Predictions for Lepton Flavor Universality Violation in Rare B Decays in Models with Gauged $L_\mu - L_\tau$

TL;DR

This paper quantifies predictions of lepton flavor universality violation in B-meson decays within gauged L_mu - L_tau models, supporting recent experimental hints and providing new observable predictions.

Contribution

It fully quantifies the universality violation predictions including uncertainties and offers new predictions for related decay observables.

Findings

Support for lepton flavor universality violation in B decays

Quantified uncertainties in the predictions

New observable predictions for B-meson decays

Abstract

A recent proposal for explaining discrepancies in angular observables in the rare decay B --> K*mu+mu- with a gauged L_mu - L_tau current carried with it the prediction of lepton flavor universality violation in related B-meson decays. This prediction gained empirical support with a subsequent hint for lepton flavor universality violation in the B --> K l+l- decay by LHCb. In this short paper we fully quantify the prediction including the associated uncertainties. We also provide new predictions for a variety of additional observables sensitive to lepton flavor universality violation in B-meson decays.