One-side forward-backward asymmetry at the LHC

TL;DR

This paper extends the concept of one-side forward-backward asymmetry at the LHC to charged leptons and bottom quarks, demonstrating its potential to probe particle couplings with sufficient data.

Contribution

It introduces and analyzes the use of $A_{OFB}$ for charged leptons and bottom quarks at the LHC, building on previous work on top quark pairs.

Findings

$A_{OFB}$ can be used to study couplings at the LHC.

Numerical results support the feasibility of $A_{OFB}$ with enough events.

Extension from top quarks to leptons and bottom quarks.

Abstract

Forward-backward asymmetry $A_{\rm FB}$ is an essential observable to study the nature of coupling in the standard model and physics beyond the standard model, as shown at LEP and Tevatron. As a proton-proton collider, the LHC does not have the preferred direction contrary to her counterpart, namely, LEP and Tevatron. Therefore $A_{\rm FB}$ is not applicable at the LHC. However for the proton the momentum of valence quark is usually larger than that of the sea quark. Utilizing this feature we have defined a so-called one-side forward-backward asymmetry $A_{\rm OFB}$ for the top quark pair production at LHC in the previous work. In this paper we extend our studies to the charged leptons and bottom quarks as the final states. Our numerical results show that at the LHC $A_{\rm OFB}$ can be utilized to study the nature of the couplings once enough events are collected.