[sém. doct] ALTAKACH Mohammad : Z’ and W’ gauge bosons in SU(2)xSU(2)xU(1) models : precision predictions for LHC.

mardi 2 juil. 2019, 10:00 → 10:30 Europe/Paris

grand amphi (lpsc)

The Standard Model (SM) of particle physics, based on the SU(3)C×SU(2)L×U(1)Y gauge group, is an extremely successful theory. Nevertheless it is widely believed to be incomplete. The unification of the SM gauge group in a larger, simple group, e.g. SO(10), E_6 is theoretically very attractive. Thus, given the fact that the possible unification groups have a rank larger than the SM, additional subgroups like a U(1) or a second SU(2) may appear at an intermediate stage when the unification group is broken down to the SM group. Consequently, new interactions appear which are, in the case of a SU(2) group factor, mediated by three new gauge bosons of which one is neutral, denoted Z', and two are charged, W′±. After the description of a class of model based on this extended gauge group, this presentation will describe the extension of the calculation of next-to-leading order (NLO) QCD corrections to the electroweak (EW) t\bar{t} production by including contributions to the t\bar{t} process due to W's, by relaxing the assumptions about the Z' couplings, and by implementing a complementary process pp→W/W′→t\bar{b}.

Transparents seminair-doctorant.pdf