QCD parity violation at LHC in warped extra dimension

TL;DR

This paper explores how warped extra dimensions can induce observable parity violation in QCD processes at the LHC, specifically in top quark pair production, through Kaluza-Klein gluon exchange.

Contribution

It demonstrates the potential for measurable QCD parity violation at the LHC within an $SO(5) imes U(1)$ gauge-Higgs unification framework, linking extra dimensions to collider observables.

Findings

Sizable charge asymmetry can be observed at the LHC.

Parity violation effects depend on specific model parameters.

The model predicts measurable deviations from Standard Model expectations.

Abstract

Extra dimension is one of the most attractive candidates beyond the Standard Model. In warped extra dimensional space-time, not only gauge hierarchy problem but also quark-lepton mass hierarchy can be naturally explained. In this setup, a sizable parity violation through Kaluza-Klein gluon exchange appears in QCD process such as helicity dependent top pair production. We investigate this QCD parity violating process by use of $SO(5) \times U(1)$ gauge-Higgs unification model. We evaluate LHC observable quantities, i.e., a charge asymmetry and a forward-backward asymmetry of the top pair production, and find that a sizable charge asymmetry can be observed with specific model parameters.