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We investigate the prospect of the LHC for discovering new physics effectsvia new strategies in the same-sign top pair and same-sign top pair associatedwith a $W$ boson signatures. Significant enhancement in production of same-signtop quarks (plus a $W$ boson) is a joint property of several models beyond thestandard model. We concentrate on the leptonic (electron and muon) decay of thetop quarks and study the exclusion reach of the LHC data for a simplified modelapproach where top quark flavor changing could occur through a $Z'$ or aneutral scalar $\phi$ exchange. Less background contributions and cleansignature are the advantages of the leptonic decay mode of the top quarks inthe same-sign production processes. A combination is performed on bothsame-sign top pair and same-sign top pair plus a $W$ boson production modeswhich enables us to reach a large fraction of the model parameter space.Assuming the couplings of new physics of the order of $10^{-2}$, the mass of aflavor changing $Z'$ or a neutral scalar above 1 TeV could be excluded. Wepropose a momentum dependent charge asymmetry and angular observables in thesame-sign top process which provide the possibility of separation of newphysics signal from the SM backgrounds as well as discrimination of the flavorchanging $tuX$ from $tcX$, where $X = Z',\phi$.

Same-sign top pair plus $W$ production in flavor changing vector and scalar models