Search for New Physics at the Large Hadron Collider (LHC) in tt production in the all-hadronic decay mode using top quark
Cheung, Yiu Him
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Many new physics models predict resonances with masses in the TeV range which decay into a pair of top quarks. With its large cross section, tt ̄ production at the CERN Large Hadron Collider (LHC) offers an excellent opportunity to search for such particles. We present a detailed study of the discovery potential of the LHC, operating at its design energy of [special characters omitted] = 14 TeV, for Kaluza-Klein (KK) excitations of the gluon in bulk Randall-Sundrum (RS) models in tt ̄ production where both top quarks decay hadronically and are identified via top-tagging. Our calculations take into account the finite resolution of detectors, the anticipated top-tagging efficiency and light jet misidentification probability as top quarks, and include the dominant di-jet background. With these assumptions, we derive 5σ discovery potentials for nine different KK gluon scenarios. We also analyze the capabilities of the LHC experiments to differentiate between individual KK gluon models. We find that, for the projected top-tagging efficiencies and light jet misidentification probabilities, and for the parameters and models chosen, KK gluons with masses up to about 3.9 TeV can be discovered at the LHC or a luminosity upgraded LHC. The ability of the LHC to discriminate between different bulk RS models and to measure the couplings of the KK gluons is found to be highly model dependent.