Heavy Flavor Gauge Boson search at the LHC

Despite its many successes, the Standard Model (SM) [1] of particle physics is believed to be an effective field theory valid only for energies up to the TeV scale. Due to its uniquely large mass, the top quark is of particular interest for the electroweak symmetry breaking mechanism and could potentially be related to new physics phenomena. Several proposed extensions to the SM predict the existence of heavy particles that decay primarily to top quark pairs. This thesis contains two parts: a theoretical motivation study. This work included Monte Carlo modelling of flavor gauge boson models. The experimental search is made in the top anti-top decay channel collected with the ATLAS experiment during Run-1 and early Run-2 where one W from a top decays leptonically (to an electron or muon plus neutrino) and the W from the second top decays hadronically. This leads to a signature with one high-transverse- momentum lepton, large missing transverse momentum (from the escaping neutrino) and hadronic jets.