Top quark forward-backward asymmetry and charge asymmetry in left-right twin Higgs model

TL;DR

This paper explores how a modified left-right twin Higgs model with a new Yukawa interaction can explain the Tevatron top quark asymmetry anomaly while remaining consistent with LHC measurements, predicting a correlation between asymmetries.

Contribution

It introduces a new Yukawa interaction in the twin Higgs model that accounts for the top quark asymmetry anomaly without conflicting with existing collider constraints.

Findings

The model explains the Tevatron $A_{FB}^t$ anomaly.

It satisfies the LHC charge asymmetry $A_{C}^t$ constraints.

Predicts a positive correlation between $A_{C}^t$ and $A_{FB}^t$.

Abstract

In order to explain the Tevatron anomaly of the top quark forward-backward asymmetry $A_{FB}^t$ in the left-right twin Higgs model, we choose to give up the lightest neutral particle of $\hat{h}$ field as a stable dark matter candidate. Then a new Yukawa interaction for $\hat{h}$ is allowed, which can be free from the constraint of same-sign top pair production and contribute sizably to $A_{FB}^t$. Considering the constraints from the production rates of the top pair ($t\bar t$), the top decay rates and $t\bar{t}$ invariant mass distribution, we find that this model with such new Yukawa interaction can explain $A_{FB}^t$ measured at the Tevatron while satisfying the charge asymmetry $A_{C}^t$ measured at the LHC.Moreover, this model predicts a strongly correlation between $A_{C}^t$ at the LHC and $A_{FB}^t$ at the Tevatron, i.e., $A_{C}^t$ increases as $A_{FB}^t$ increases.