Limits on new coloured fermions using precision jet data from the Large Hadron Collider

TL;DR

This paper uses precise jet data from the ATLAS experiment to set exclusion limits on hypothetical new coloured fermions by analyzing their impact on QCD predictions and comparing with observed data.

Contribution

It introduces a method to constrain new coloured fermions using high-precision jet measurements and renormalization group equation modifications.

Findings

95% CL exclusion limits on new coloured fermions

Modified QCD predictions match experimental data within uncertainties

Constraints depend on the fermion mass $m_X$

Abstract

This work presents an interpretation of high precision jet data from the ATLAS experiment in terms of exclusion limits for new coloured matter. To this end, the effect of a new coloured fermion with a mass $m_X$ on the solution of the renormalization group equation QCD is studied. Theoretical predictions for the transverse energy-energy correlation function and its asymmetry are obtained with such a modified solution and, from the comparison to data, 95\% CL exclusion limits are set on such models.