Associated production of a Kaluza–Klein excitation of a gluon with a tt¯ pair at the LHC

In certain model-realizations of the Randall–Sundrum scenario, the Kaluza–Klein (KK) excitations of the gluon, gKKgKK have enhanced couplings to right-handed top quarks. In the absence of a gggKKgggKK coupling in these models, the single production of a gKKgKK from an initial gg   state is not possible. The search for other production mechanisms at the LHC, therefore, becomes important. We suggest that the associated production of a gKKgKK with a tt¯ pair is such a mechanism. Our parton-level study, which neglects detection efficiencies, shows that through this process the LHC can probe KK gluon masses in the range of 2.8–3.0 TeV.