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T: Fachverband Teilchenphysik

T 71: Supersymmetry: Theory and searches

T 71.7: Vortrag

Donnerstag, 2. April 2020, 18:00–18:15, H-HS VI

Search for direct stau production in events with one hadronically and one leptonically decaying tau lepton with the ATLAS detector — •Anna Bertolini and Alexander Mann — Ludwig-Maximilians-Universität, Munich

Supersymmetry (SUSY) provides a solution to many open questions of the Standard Model (SM). It postulates the existence of supersymmetric partners of the elementary particles of the SM. In many SUSY models the mass order of the supersymmetric leptons (sleptons) is reversed compared to the SM, making the supersymmetric tau (stau) the lightest slepton and therefore possibly accessible at the LHC.
Direct stau production has been studied with the ATLAS detector, assuming that both staus decay into a tau lepton and a stable neutralino. An analysis considering only hadronically decaying taus (HadHad Channel) found no significant excess over the expected SM background.
The presented study looks at a final state with one tau decaying hadronically and one leptonically (LepHad Channel). The advantage of this channel is the possibility to trigger on a light lepton with lower offline thresholds than required for the tau triggers. Therefore, it is possible to search for direct stau production covering a phase-space region to which the HadHad-channel is not sensitive.