Parity Violation in QCD Process

TL;DR

This paper investigates potential parity violation in QCD processes at the LHC, using effective operators to distinguish new physics models like supersymmetry and extra dimensions through top quark pair asymmetries.

Contribution

It introduces an effective operator framework to analyze parity violation in top quark pair production, enabling discrimination between various beyond Standard Model theories.

Findings

No parity violation found in the Standard Model.

Proposed asymmetry measurements can differentiate supersymmetric models from extra-dimensional theories.

Discussion includes electroweak and little Higgs contributions to asymmetry.

Abstract

Parity violation in QCD process is studied using helicity dependent top quark pair productions at Large Hadron Collider experiment. Though no violation can be found in the standard model (SM), new physics beyond the SM predicts the violation in general. In order to evaluate the violation, we utilize an effective operator analysis in a case that new particles predicted by the new physics are too heavy to be directly detected. By using this method, we try to discriminate supersymmetric SM from universal extra-dimension model via an asymmetry measurement of the top quark pair production. We also discuss the asymmetry from the SM electroweak top pair production process and that from the little Higgs model.