Abstract:
Based on the CMS inclusive multilepton analysis and a CMS 2HDM search involving lepton and photon final states, we present a \,\%$ CL limit on the branching ratio of the flavorchanging decay ${\rm t}\to{\rm c}\textrm{H}$.The data sample corresponds to .5\,\textrm{fb}^{1}$ of integrated luminosity in pp collisions at $\sqrt{s} = 8\,\textrm{TeV}$ collected by the CMS experiment at the LHC in 2012. We find that $\mathcal{B}({\rm t}\to{\rm c}\textrm{H}) < 0.56\,\%$, corresponding to a bound on the left and righthanded topcharm flavor violating Higgs Yukawa couplings of $\sqrt{\lambda_{{\rm tc}}^\textrm{H}^2 + \lambda_{{\rm ct}}^\textrm{H}^2} < 0.14$. The observed bound is consistent with the expected bound of .65\,\%$.
