Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 58: Top-Physik II
T 58.3: Vortrag
Mittwoch, 27. März 2019, 16:30–16:45, S10
Studies of background processes for the search of the simultaneous production of four top quarks at the ATLAS detector — •Lennart Rustige and Romain Madar — LPC, Clermont-Ferrand, Frankreich
The search for the simultaneous production of four top quarks has so far been dominated by searches for physics beyond the standard model. Using the full dataset of the LHC Run II recorded at the ATLAS detector, corresponding to an integrated luminosity of almost L = 150 fb−1, the observation of this process as predicted by the standard model (SM) may finally come within reach.
This process is fairly rare under the SM assumption, with a next-to-leading order prediction for the production cross-section of σtttt =11.97−21%+18% fb [arXiv:1711.02116] at a centre-of-mass energy of √s = 13 TeV. Therefore, detailed studies of the background processes play an important role for the search of this process. This contribution discusses some of these studies, where the final state signature contains either a lepton pair with the same electric charge, three leptons or four leptons.