Simple models for the top asymmetry: constraints and predictions

TL;DR

This paper analyzes six new physics models to understand their potential to explain the Tevatron top quark forward-backward asymmetry, considering constraints from LHC measurements and predicting charge asymmetries at the LHC.

Contribution

It provides a comprehensive analysis of the parameter space for six new physics models and their implications for top asymmetry measurements at the LHC.

Findings

Constraints from LHC t tbar tail measurements are significant for Z' and W' models.

Predictions for charge asymmetries at LHC vary across models.

Certain models can accommodate the Tevatron asymmetry within current experimental bounds.

Abstract

We perform a comprehensive study of the allowed range for the Tevatron t tbar forward-backward asymmetries in six representative new physics models: a flavour-changing Z' boson, a scalar isodoublet, a W' boson, a heavy axigluon, a colour-triplet and a colour-sextet scalar. We devote special attention to the constraints from the t tbar tail at LHC on the parameter space, which will be dramatic if the measurements agree with the SM prediction, specially for Z' and W' bosons. We also study the predictions for the charge asymmetries at LHC and compare several proposed definitions.