  With the upcoming run of the Large Hadron Collider (LHC) at much higher
center of mass energies, the search for Beyond Standard Model (BSM) physics
will again take center stage. New colored particles predicted in many BSM
scenarios are expected to be produced with large cross sections thus making
them interesting prospects as a doorway to hints of new physics. We consider
the resonant production of such a colored particle, the diquark, a particle
having the quantum number of two quarks. The diquark can be either a scalar or
vector. We focus on the vector diquark which has much larger production cross
section compared to the scalar ones. In this work we calculate the
next-to-leading order (NLO) QCD corrections to the on-shell vector diquark
production at the LHC produced through the fusion of two quarks as well as the
NLO corrections to its decay width. We present full analytic results for the
one-loop NLO calculation and do a numerical study to show that the NLO
corrections can reduce the scale uncertainties in the cross sections which can
be appreciable and therefore modify the expected search limits for such
particles. We also use the dijet result from LHC to obtain current limits on
the mass and coupling strengths of the vector diquarks.
