Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 71: Supersymmetry: Theory and searches

T 71.6: Talk

Thursday, April 2, 2020, 17:45–18:00, H-HS VI

Search for Direct Pair Production of Staus with Two Hadronically Decaying Taus in the Final State at the ATLAS Detector in Run 2 — •Clara Leitgeb and Alexander Mann — Ludwig-Maximilians-Universität, München

Supersymmetry is a popular extension of the Standard Model of particle physics. In particular, the search for direct pair production of the supersymmetric partners of left- and right-handed taus (staus) is an important goal of the ATLAS physics program.

Using the full dataset that was taken during Run 2 of the LHC at a center-of-mass energy of 13 TeV, a cut-and-count based analysis of events containing two hadronically decaying taus and missing transverse energy was performed. Despite the low stau production cross section it was possible to exclude degenerate stau masses up to 390 GeV and neutralino masses up to 140 GeV at 95% confidence level. Furthermore, separate exclusion limits for the supersymmetric partners of left-handed taus could be derived.

The analysis will be presented in this talk together with possible improvements of these limits by using machine-learning techniques and studying compressed scenarios.