Constraints on four-fermion interactions from the $t\bar{t}$ charge asymmetry at hadron colliders

TL;DR

This paper investigates how measurements of top quark charge asymmetry at hadron colliders can constrain four-fermion interactions beyond the Standard Model, providing limits on effective operator coefficients.

Contribution

It compares the sensitivity of cross-section and charge asymmetry measurements to four-fermion operators and derives stringent limits from combined collider data.

Findings

Stringent limits on effective operator coefficients $C_1$ and $C_2$

Charge asymmetry measurements are highly sensitive to new physics

Combined Tevatron and LHC data improve constraints

Abstract

The charge asymmetry in top quark production at hadron colliders is sensitive to beyond-the-Standard-Model four-fermion interactions. In this study we compare the sensitivity of cross-section and charge asymmetry measurements to effective operators describing four-fermion interactions and study the limits on the validity of this approach. A fit to a combination of Tevatron and LHC measurements yields stringent limits on the linear combinations $C_1$ and $C_2$ of the four-fermion effective operators.