# Explaining $B\to K^{(*)}\ell^+ \ell^-$ anomaly by radiatively induced coupling in $U(1)_{\mu-\tau}$ gauge symmetry

## TL;DR

This paper introduces a $U(1)_{\mu-\tau}$ gauge symmetry extension of the Standard Model with extra particles, explaining B-meson decay anomalies and dark matter within a unified framework through radiative corrections.

## Contribution

The model uniquely combines dark matter and B physics anomalies by radiatively inducing couplings via new particles and symmetries, providing a novel explanation for observed anomalies.

## Key findings

- Radiative corrections induce $\Delta C_9 \sim -1$, explaining LHCb anomalies.
- Model accommodates dark matter and flavor physics constraints.
- Consistent with collider and dark matter search results.

## Abstract

We propose an extension of the standard model (SM) with $U(1)_{\mu-\tau}$ gauge symmetry, extra vectorlike quark doublets $Q'_a$ and singlet scalar $\chi$, both of which are charged under $U(1)_{\mu-\tau}$ and carry {odd} dark $Z_2$ parity. Then assuming that $\chi$ is the dark matter (DM) of the universe and imposing various constraints from dark matter search, flavor physics and collider search for $Q'_a$, one can show that radiative corrections to $b\rightarrow s Z^{'*} \rightarrow s l^+ l^- $ involving $Q'_a$ and $\chi$ can induce $\Delta C_9 \sim -1$ which can resolve the LHCb anomalies related with $B\to K^{(*)} \ell^+ \ell^-$. Therefore both DM and $B$ physics anomalies could be accommodated in the model.