Soft gluon resummation in associated top-antitop and the Higgs, Z or W boson at the LHC

by Prof. Leszek Motyka (Jagiellonian University, Krakow)

Thursday 26 Sep 2019, 15:15 → 16:15 Europe/Stockholm

HUB (Institutionen för teoretisk fysik)

In order to maximize physics potential of the LHC it is necessary to provide precise theoretical predictions of the Standard Model processes. The soft gluon resummation is a powerful technique to improve fixed order predictions through all-order resummation of enhanced terms in the perturbative QCD series. We apply this technique to calculate cross sections for hadroproduction processes of the heaviest particles of the Standard Model: top-antitop + the Higgs boson, and top-antitop + the W or Z boson. The foundations of the soft gluon resummation and the calculational method will be described. Results will be presented through next-to-next-to-leading logarithmic (NNLL) accuracy matched to the existing next-to-leading order (NLO) results. The theoretical accuracy of the obtained NLO+NNLL predictions is significantly improved with respect to the NLO results. The predictions for total and differential cross sections will be compared to recent data from the LHC.