Topical Seminar: Phenomenology of $t\bar{t}H$ Production with Top Quark Running Mass and the Differential Cross-Section Measurement of $t\bar{t}+jets$ Production in the Dilepton Channel at $\sqrt{s}=$13 TeV

por Andrej Saibel (DESY)

miércoles 1 dic. 2021 15:00 → 16:30 Europe/Madrid

1001-Primera-1-1-1 - Paterna. Seminario (Universe)

The study of the Yukawa interactions between the fermions and the Higgs boson is an essential step for confirming the Standard Model (SM) nature of the spin-0 particle that was observed in the year 2012.
Since the top quark is the most massive known elementary particle, the top quark pair production in association with a Higgs boson ($t\bar{t}H$) is an excellent candidate to study the Yukawa coupling, 
which is predicted to be proportional to the mass of the fermions by the SM.
Following the observation of the top-Higgs Yukawa coupling by the ATLAS and CMS collaborations in 2018, efforts are undertaken to improve the measurements in the future.
With these improvements in mind, we study both the signal and the background modeling of the $t\bar{t}H$ process.
The phenomenology of the $t\bar{t}H$ production with the top quark running mass in the $\overline{MS}$ renormalization scheme is studied for the first time. 
These simulations show a slight reduction of scale uncertainties compared to the on-shell renormalization scheme.
Furthermore, a differential cross-section measurement of the $t\bar{t}+jets$ production at $\sqrt{s}=13$ TeV with the largest available data set is presented.
The measurement is the most precise to date.