Tau lepton charge asymmetry and new physics at the LHC

TL;DR

This paper explores how tau-lepton charge asymmetry at the LHC can be used to detect new physics beyond the Standard Model, focusing on Z' bosons and vector lepto-quarks.

Contribution

It introduces the use of tau charge asymmetry as a probe for non-standard physics, analyzing both resonant and non-resonant scenarios involving tau-leptons.

Findings

Charge asymmetry is sensitive to new physics signals.

Constraints on Z' bosons and lepto-quarks can be derived.

Potential for future LHC analyses to discover or limit new physics.

Abstract

We consider the possibility of studying new physics that singles out the tau-lepton at the LHC. We concentrate on the tau-lepton charge asymmetry in tau+tau- pair production as a tool to probe this physics beyond the Standard Model. We consider two generic scenarios for the new physics. We first study a non-universal Z' boson as an example of a new resonance that can single out tau-leptons. We then consider vector lepto-quarks coupling of the first generation quarks with the third generation leptons as an example of non-resonant new physics. We find that in both cases the charge asymmetry can be sufficiently sensitive to the new physics to provide useful constraints at the LHC.