Precise LHC limits on the $\rm{U}_1$ leptoquark parameter space

TL;DR

This paper uses current LHC data to set precise bounds on the parameter space of the vector U1 leptoquark, which could explain B meson decay anomalies, emphasizing the importance of including both resonant and non-resonant production modes.

Contribution

It provides the first comprehensive bounds on the U1 leptoquark parameter space from LHC data, highlighting the significance of resonant and non-resonant production modes.

Findings

Resonant production modes are crucial for low mass bounds.

Non-resonant modes dominate at higher masses.

Current LHC data constrains U1 leptoquark explanations of B anomalies.

Abstract

A TeV scale leptoquark (LQ) is one of the promising explanations of the recent anomalies in the semileptonic decays of $B$ mesons. Among the various LQs, the vector $\rm{U}_1$ is capable of explaining the anomalies in both $R_{D^{(*)}}$ and $R_{K^{(*)}}$ observables. We use the current LHC data to put bounds on the parameter space of $\rm{U}_1$ relevant for the anomalies. Precise bounds are drawn by recasting the latest $\tau\tau$ and $\mu\mu$ searches by the ATLAS and CMS collaborations. We find that it is imperative to include the resonant production modes for obtaining limits in the low mass regions. For higher mass points, the non-resonant production modes play a dominant role.