Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 36: Supersymmetrie I

T 36.3: Talk

Tuesday, March 26, 2019, 16:30–16:45, S11

Search for stau pair production in proton-proton collisions at the LHC with the ATLAS detectors — •Patrick Selle, Zinonas Zinonos, and Hubert Kroha — Max Planck Institut für Physik, München, Deutschland

Supersymmetry (SUSY) provides solutions to many open problems of the Standard Model (SM) such as the hierarchy problem and the mystery of Dark Matter (DM). In certain SUSY models, the supersymmetric partner of the τ-lepton, the stau (τ), is expected to be lighter than other sleptons, such that its mass could be at the electroweak scale. Models involving coannihilation between the stau and the lightest supersymmetric particle (LSP), which can be almost mass-degenerate, can reproduce the relic DM density of the universe as measured by cosmological observations. At the LHC, staus would be pair-produced and decay into their SM counterpart and the LSP. Typical stau events would therefore be characterized by the presence of SM tau leptons and the production of significant missing energy arising from the LSP pair and the neutrinos from the tau decays. This talk presents the strategy for searching for stau-pair production in final states with one hadronically decaying and one leptonically decaying tau lepton. The analysis relies on data using events in the ATLAS detector. Multivariate analysis techniques are applied to achieve the highest possible signal sensitivity.