Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 50: Suche nach Supersymmetrie II

T 50.5: Talk

Wednesday, March 21, 2018, 17:30–17:45, Philo-HS3

Search for direct pair production of scalar tau leptons in final states with two hadronically decaying taus with the ATLAS detector — •Ferdinand Krieter, Clara Leitgeb, and Alexander Mann — Ludwig-Maximilians-Universität München

As a proposed fundamental symmetry of nature, Supersymmetry provides elegant solutions to various open questions of the standard model by predicting superpartners of known particles, whose spins differ by one half unit. In R-parity-conserving models, these hypothetical particles are pair-produced and decay ultimately into the stable, lightest supersymmetric particle, providing a candidate for dark matter. A search for electroweak pair production of scalar tau leptons in final states with two hadronically decaying leptons, missing transverse momentum and low jet activity is presented. The simplified signal models consider scalar tau leptons decaying exclusively into a tau lepton and a stable neutralino. Such a production mode may dominate if the strongly interacting superpartners and gauginos are heavy and thus beyond the reach of currently probed energy scales. The analysis uses pp collision data at a center of mass energy of 13 TeV, recorded with the ATLAS detector from 2015 to 2017. Variables computed with the recursive jigsaw reconstruction technique are studied for the purpose of developing signal selections with optimal sensitivity. For the estimation of the multijet background a data-driven fake-factor method is presented. To allow for a measurement of the tau fake rates, a procedure to reweight data collected by a set of partially prescaled single jet triggers is used.