Asymmetries in t tbar production: LHC versus Tevatron

TL;DR

This paper compares charge asymmetry measurements in top-antitop production at LHC and Tevatron to identify potential new physics sources like Z', W' bosons, scalars, and axigluons.

Contribution

It demonstrates how combined asymmetry measurements can distinguish among various new physics models affecting top pair production.

Findings

Charge asymmetry measurements constrain new physics models.

Different models predict distinct asymmetry patterns at LHC and Tevatron.

Combined data can identify the nature of potential new particles.

Abstract

The measurement of a charge asymmetry in t tbar production at LHC constitutes more than an independent confirmation of the forward-backward asymmetry found at Tevatron. Indeed, both measurements together can be used to identify the source of the asymmetry. This is demonstrated for the case of new Z', W' vector bosons and colour-sextet and triplet scalars, exchanged in t, u channels respectively, and a very heavy axigluon in the s channel.