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T: Fachverband Teilchenphysik

T 76: Suche nach Physik jenseits des Standardmodels IV

T 76.8: Vortrag

Donnerstag, 22. März 2018, 18:15–18:30, Philo-HS4

Reinterpretation of the ATLAS search for stop quarks decaying through tau sleptons as a search for 3rd generation leptoquarks — Alexander Mann and •Alexander Mario Lory — Ludwig-Maximilians-Universität München

Leptoquarks appear in many extensions of the Standard Model and can potentially help us understand the similarities between quark and lepton generations. A recent study, motivated by supersymmetry, analysed events with final states with tau leptons, b-quarks and missing transverse momentum in the dataset recorded with the ATLAS detector in 2015 and 2016. No deviation from the Standard Model was observed. The results of a reinterpretation of this analysis in terms of third generation leptoquarks of up- and down-type is presented. Leptoquark signal models are analysed and compared to the supersymmetric benchmark models. The reinterpretation has good exclusion power for intermediate values of the model paramater β, which determines the branching ratio of a leptoquark decaying to a charged lepton and a quark. For β=0.5, the up-type and down-type models are excluded for leptoquark masses up to 780 and 800 GeV, respectively.