Study the Forward-Backward Asymmetry of the Top Quark Production in the Randall-Sundrum Model with an Extension of Strong Interaction

TL;DR

This paper investigates the forward-backward asymmetry of top quark production within an extended Randall-Sundrum model, showing that certain parameter choices can explain experimental anomalies without conflicting with existing data.

Contribution

It introduces an extension of the Randall-Sundrum model with an additional strong interaction group and demonstrates its ability to account for the observed top quark asymmetry.

Findings

Parameter $c_q extgreater 0.5$ and $c_t$ between -0.6 and -0.8 fit the data.

Axial gluon excitation around 5-6 TeV explains the asymmetry.

Model remains consistent with other experimental constraints.

Abstract

The large forward-backward asymmetry of the top quark pair production measured by the hadron colliders shed light on new physics signals beyond the Standard Model. In the Randall-Sundrum model with an additional SU(3) group in the strong sector, we compare the total cross section and forward-backward asymmetry of the top quark pair production with the newest data obtained by the CDF and the D0 collaborations. Our numerical analysis shows that the parameter $c_q \gtrsim 0.5$, $c_t \sim -0.6\sim-0.8$, $\tan\phi \gtrsim 20$ or $\tan\phi \leq 1/20$ and the first excitation of axial gluon with a mass about $5 \thicksim 6 \mathrm{TeV}$ can accommodate this large anomaly without violating other experimental constraints.