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The presence of the anomalous top quark flavour changing neutral current(FCNC) interactions leads to the production of same-sign top quarks inproton-proton collisions. The results of a search for events with same-signdileptons and b-jets conducted by CMS collaboration with 10.5 $fb^{-1}$ of datacollected in pp colisions at $\sqrt{s}=8$ TeV are used to obtain theconstraints on the strength of top quark FCNC interactions. The 95$%$confidence level upper limits on the branching ratios of top quark decays to alight quark $q=u,c$ and a gauge or a Higgs boson are set to be ${\calB}R(t\rightarrow u \gamma) < 1.27%$, ${\cal B}R(t\rightarrow u Z) < 0.8% $,${\cal B}R(t\rightarrow u g) < 1.02% $ and ${\cal B}R(t\rightarrow u H) < 4.21%$. The sensitivity of future searches in the same-sign top quark channel isalso presented.

Search for top quark flavour changing neutral currents in same-sign top quark production