Forward-backward asymmetry of top quark in unparticle physics

TL;DR

This paper investigates how unparticle physics could explain the observed deviation in the top quark forward-backward asymmetry at Tevatron, providing parameter regions consistent with experimental data.

Contribution

It introduces a calculation of the top quark asymmetry within unparticle physics and identifies parameter regions aligning with measurements, extending beyond Standard Model predictions.

Findings

Unparticle contributions can account for the observed asymmetry deviation.

Identified parameter space where unparticles match experimental asymmetry and cross section.

Provides constraints on unparticle parameters based on top quark data.

Abstract

The updated CDF measurement of the forward-backward asymmetry (FBA) in the top quark production p{bar p} -> t{bar t} at Tevatron (with the CMS energy 1.96 TeV) shows a deviation of 2*sigma from the value predicted by the Standard QCD Model. We present calculation of this quantity in the scenario where colored unparticle physics contributes to the s-channel of the process, and obtain the regions in the plane of the unparticle parameters lambda and dU which give the values of the FBA and of the total t{bar t} production cross section compatible with the present measurements.