Seminarium "Teoria cząstek elementarnych i kosmologia"

The studies of the associated production processes of a top-quark pair with a heavy colour-singlet boson, e.g. Higgs, W or Z, are among the highest priorities of the LHC programme. Correspondingly, precision of theoretical predictions for 2 to 3 processes is of central importance, yet possibilities to reduce theoretical uncertainties using fixed-order perturbation theory are currently technically limited. In this talk, latest results on resummation of soft gluon corrections for this class of processes are reviewed. In particular, improvements due to resummation to fixed-order predictions, both total cross sections and differential distributions, are discussed and confronted with experimental data.