Charge Asymmetry in Top Pair plus Jet Production -- A Snowmass White Paper

TL;DR

This paper explores novel observables for detecting top-quark charge asymmetry in top-antitop plus jet production at the LHC, highlighting potential for significant measurements at higher energies and luminosities.

Contribution

It introduces the incline and energy asymmetries as new tools to probe charge asymmetry in top pair plus jet production at the LHC.

Findings

Significant charge asymmetry signals can be observed at 14 TeV with high luminosity.

The incline and energy asymmetries effectively probe quark-antiquark and quark-gluon channels.

Potential for precise measurements at future high-luminosity LHC upgrades.

Abstract

We investigate the discovery potential of the top-quark charge asymmetry at the LHC in top-antitop production in association with a hard jet. In this process, the charge asymmetry can be accessed via two novel observables: the incline asymmetry, which probes the quark-antiquark channel, and the energy asymmetry, which gives access to the quark-gluon channel. At 8 TeV collision energy, the significance for both observables is statistically limited. With 14 TeV and an integrated luminosity of 50 inverse fb or more, an asymmetry of up to -12% can be observed with a statistical significance of more than 5 standard deviations. Prospects of measuring the charge asymmetry at the intended high-luminosity and high-energy LHC upgrades are discussed.