Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 19: Top-Quarks: Produktion II

T 19.3: Vortrag

Montag, 19. März 2018, 16:30–16:45, Z6 - SR 2.011

Differential cross section measurement of top quark pair production with associated bottom quarks in the dilepton channel at 13 TeV — Maria Aldaya Martin, Carmen Diez Pardos, and •Andrej Saibel — DESY, Notkestraße 85, 22607 Hamburg

Good experimental knowledge of top quark pair production with additional jets (tt+jets) is essential to pave the way to the observation of top quark pair production in association with a Higgs boson (ttH) which allows direct measurement of the top-Higgs Yukawa coupling. In particular, tt+b(b), with bottom quarks originating from gluon splitting, constitutes an irreducible, non-resonant background for the ttH process, where the Higgs boson decays into a bottom quark pair ttH(bb). Moreover, the state-of-the-art of QCD calculations for tt+b(b) production have significant uncertainties from missing higher-order terms, making direct experimental measurements of this process desirable.

In this talk, a differential cross section measurement of the tt+b(b) process in the dileptonic final state at 13 TeV is presented. The main focus is to study the behavior of additional jets, those that do not originate from the decay of top quarks. The differential cross sections of the additional jets are then compared to several different particle level predictions.