Review of new physics effects in t-tbar production

TL;DR

This paper reviews potential new physics explanations for the observed forward-backward asymmetry in top-antitop production, analyzing models, experimental constraints, and future signals at the LHC.

Contribution

It provides a comprehensive review of models explaining the asymmetry and discusses experimental constraints and predictions for the LHC.

Findings

Certain new physics models can produce large asymmetries

Constraints from dijet resonance searches limit model parameters

Predicted signals at the LHC could confirm or refute these models

Abstract

Both CDF and DO report a forward-backward asymmetry in t-tbar production that is above the standard model prediction. We review new physics models that can give a large forward backward asymmetry in t-tbar production at the Tevatron and the constraints these models face from searches for dijet resonances and contact interactions, from flavor physics and the t-tbar cross section. Expected signals at the LHC are also reviewed.