Seminarium Kosmologia i Fizyka Cząstek

Determination of the coupling of the recently discovered Higgs boson to thetop quark currently belongs to one of the most challenging tasks of the highenergy experimental physics. The anomalous ttH coupling affects the secondary lepton distributions in the process of associated production of the top quark pair and Higgs boson in the proton-proton collisions at the LHC. I will show that, although the gluon fusion mechanism dominates the ttH production in proton-proton collisions at s^(1/2) = 14 TeV, the contribution of quark-antiquark hard scattering processes is quite substantial and, therefore, should be taken into account in the analyses of data. I will also explain why the effects of the scalar and pseudoscalar anomalous couplings in the unpolarized cross section of the process arealmost completely insensitive to the sign of either of them.