Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 50: Suche nach Supersymmetrie II
T 50.8: Talk
Wednesday, March 21, 2018, 18:15–18:30, Philo-HS3
Search for supersymmetry in multileptonic final states with collimated τ pairs with the ATLAS detector — •Marian Rendel, Zinonas Zinonos, Hubert Kroha, and Johannes Junggeburth — Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München
The search for supersymmetry (SUSY) is a major part of the ATLAS physics program. Due to the low Standard Model background, the search for four-lepton final states provides excellent sensitivity to R-parity violating (RPV) SUSY models where the lightest supersymmetric particle (LSP), produced in pairs, decay into final states with at least two charged leptons. For LSP decays into hadronically decaying τ lepton pairs, however, the current analysis is not sensitive if the mass difference between LSP and the next heavier NLSP is large, because the τ jet become highly collimated and the standard τ reconstruction method is not able to resolve them. A new specialized high-pT τ jet pair reconstruction method has been developed for LHC run-2 at 13 TeV center-of-mass energy. In this talk, the application of the new reconstruction technique to the four-lepton RPV SUSY search is discussed as well as further improvements of the method to recover also low-pT τ pairs.