Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 19: Top-Quarks: Produktion II
T 19.4: Vortrag
Montag, 19. März 2018, 16:45–17:00, Z6 - SR 2.011
Studies on the measurement of the ttZ production cross section in the dilepton channel — Otmar Biebel1, •Florian Fischer1, Thomas McCarthy2, and Jeannine Wagner-Kuhr1 — 1Ludwig-Maximilians-Universität, München — 2Max-Planck-Institut für Physik, München
In top quark physics, the associated production of top-antitop quark pairs with a Z boson plays an important role as this process is sensitive to the coupling of the Z boson to the top quark. This value can vary significantly in many models including physics beyond the Standard Model. Additionally, ttZ has a quite similar signature to e.g. the production of top-antitop quark pairs in association with a Higgs boson.
For the studies presented in this talk Monte Carlo simulations, normalised to an integrated luminosity of 120 fb−1, are used. This is equal to the expected amount of proton-proton collisions taken at a centre-of-mass energy of 13 TeV by the ATLAS experiment during the entire LHC Run-2. The ttZ system with an electron-positron or muon-antimuon pair in the final state will be kinematically reconstructed under the assumption, that the charged leptons originate from the decay of the Z boson and the top quark pair decays fully hadronically. In order to separate the signal from the two most dominant background processes, tt and Z+jets, a multivariate technique will be applied.