Improving top quark induced charge asymmetries at the LHC using ttbar transverse momentum

TL;DR

This paper proposes a method to improve the detection of top quark charge asymmetries at the LHC by using the transverse momentum of the top-antitop pair, leading to increased significance in measurements.

Contribution

It introduces a novel analysis technique combining transverse momentum with other variables to optimize asymmetry significance in LHC data.

Findings

Including $t\bar t$ transverse momentum significantly enhances asymmetry significance.

Optimal cuts on variables improve the sensitivity of charge asymmetry measurements.

Method is effective for the 2012 LHC data set.

Abstract

We study how the significance of top quark induced charge asymmetries at the LHC may be enhanced exploiting the $t\bar t$ total transverse momentum to enrich the fraction of quark fusion events in the sample. We combine this variable with previous variables related to the boost and the invariant mass of the $t\bar t$ pair to find an optimum cut which maximizes the significance of the asymmetry when systematic and statistic errors are taken into account. We find that including the $t\bar t$ transverse momentum in the analysis of the expected 2012 LHC data provides a considerable enhancement in the significance of the asymmetry.