Signature of the $\gamma$+jet and dijet production mediated by an excited quark with QCD next-to-leading order accuracy at the LHC

TL;DR

This paper provides a detailed QCD NLO analysis of excited quark production and decay at the LHC, improving constraints on model parameters and offering key kinematic distributions and exclusion limits.

Contribution

It introduces a QCD NLO calculation for excited quark production and decay, refining predictions and constraints compared to previous leading-order studies.

Findings

QCD NLO corrections tighten parameter constraints

Reduced scale dependence of cross sections

Established exclusion limits for excited quark mass

Abstract

We present a detailed study of the production and decay of the excited quark at the QCD next-to-leading order (NLO) level at the Large Hadron Collider, using the narrow width approximation and helicity amplitudes method. We find that the QCD NLO corrections can tighten the constraints on the model parameters and reduce the scale dependencies of the total cross sections. We discuss the signals of the excited quark production with decay mode $q^{\ast}\rightarrow q\gamma$ and $q^{\ast}\rightarrow qg$, and present several important kinematic distributions. Moreover, we give the upper limits of the excited quark excluded mass range and the allowed parameter space for the coupling constants and the excited quark mass.