Azimuthal decorrelation in $t\bar{t}$ production at hadron colliders

TL;DR

This paper introduces a new azimuthal angle difference observable in top-antitop quark pair production at hadron colliders, useful for probing QCD processes and potential new physics, with implications for testing the Standard Model and beyond.

Contribution

It proposes a novel observable, $ riangle ext{phi}$, for analyzing $tar{t}$ production, enhancing the ability to discriminate between Standard Model predictions and new physics models.

Findings

Provides a method to test QCD radiative processes.

Offers a tool to distinguish new physics models.

Enables analysis of existing collider data for new insights.

Abstract

We present a new observable, $\Delta \phi$, an azimuthal angle difference between $t$ and $\bar{t}$ quarks in $t\bar{t}$ pair production, at hadron colliders as an interesting probe of the radiative quantum chromodynamics process as well as a high-order correction in the high-mass regime. This variable also enables good discrimination on some new physics models that may explain the forward-backward charge asymmetry of $t\bar{t}$ production measured at the Tevatron. With a reliable estimation of the dataset obtained up to 2011 at the Tevatron and Large Hadron Collider, we present an opportunity for testing the standard model as well as searching new physics models with the $\Delta \phi$ observable.