Forward-backward asymmetry and differential cross section of top quark in flavor violating $Z'$ model at $\mathscr{O}(\alpha_s^2 \alpha_X)$

TL;DR

This paper calculates the top quark forward-backward asymmetry and differential cross section in a flavor violating $Z'$ model at Tevatron, including higher-order corrections, to better match experimental data.

Contribution

It introduces a calculation of top quark asymmetry and cross section at higher order in a $Z'$ model, improving agreement with experimental observations.

Findings

Higher-order corrections improve fit to differential cross section data.

The model's coupling $g_X$ must be comparable to the strong coupling $g_s$.

Forward-backward asymmetry remains consistent with measurements after corrections.

Abstract

In this paper, forward-backward asymmetry and differential cross section of top quark in flavor violating $Z'$ model up to $\mathscr{O}(\alpha_s^2 \alpha_X)$ at Tevatron are calculated. In order to account for the top observed large forward-backward asymmetry, the new coupling $g_X$ among $Z'$ and quarks will be not much less than strong coupling constant $g_s$. After including the new higher order correction, the differential cross section can fit the data better than those only including the leading contributions from $Z'$, while the forward-backward asymmetry is still in agreement with the measurement.