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

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