# Search for opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies

## TL;DR

This paper investigates the potential signals of flavor anomalies in B-meson decays at the LHC by searching for specific muon-tau pairs and b-jets, aiming to test effective field theory explanations beyond the Standard Model.

## Contribution

It introduces a novel search strategy for flavor anomaly-related operators at the LHC involving muon-tau pairs and b-jets, providing discovery and exclusion limits.

## Key findings

- Set limits on model parameters as a function of luminosity.
- Identified potential signals for flavor anomalies at 13 TeV LHC.
- Proposed a new final state signature for testing B-meson decay anomalies.

## Abstract

Extant anomalies in several semileptonic $B$-meson decays argue for physics beyond the Standard Model. Measurements of both neutral-current decays (such as $R_K$, $R_{K^*}$ and $B_s\rightarrow \phi\mu\mu$) as well as charged-current ones- $R(D)$ and $R(D^*)$ -provide strong hints for the violation of lepton flavor universality. Recent studies have shown that a class of effective field theory (EFT) models may explain such anomalies in terms of only a few parameters which can be determined phenomenologically. In this literature, we examine such resolutions in the context of the requisite $(\bar{s}$ $b$)($\bar\tau\ \tau)$ operator, and look for its signals at the 13 TeV LHC, with a final state of one $b$-jet, and an oppositely charged $\mu$-$\tau$ pair, with the muon coming from the decay of one of the $\tau$ leptons. We obtain discovery and exclusion limits on the model parameters as a function of luminosity at the 13 TeV LHC.