Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 26: Suche nach Supersymmetrie II (Leptonische Endzustände)
T 26.6: Vortrag
Montag, 29. Februar 2016, 18:00–18:15, VMP5 HS B2
Data-driven background estimates in searches for supersymmetry in final states with two same-sign leptons, jets and ETmiss with the ATLAS detector — •Peter Tornambè and Fabio Cardillo — Albert-Ludwigs Universität Freiburg
Supersymmetry is one of the most studied theories to extend the Standard Model. If R-parity is conserved, SUSY particles are produced in pairs and the lightest supersymmetric particle which is typically the lightest neutralino χ01 is stable. In many models the LSP can be a suitable candidate for dark matter.
This talk presents a search for supersymmetric phenomena in final states with two leptons of the same electric charge, jets and missing transverse energy ETmiss. While the same-sign leptons signature is present in many supersymmetric scenarios, SM processes leading to such events have very small cross-sections. Therefore, this analysis benefits from a small SM background in the signal regions leading to a good sensitivity especially in compressed regions of the SUSY phase-space. The other main sources for SM processes contaminating the signal regions are fake-leptons and leptons with a charge mis-identification. While background originating from prompt same-sign lepton sources is estimated with simulated Monte Carlo events, the non-prompt sources are addressed with data-driven techniques.
Within this talk, the current analysis strategy in Run-II will be presented focussing on the methods used for the background estimation and sensitivity optimization. But also the latest results obtained during the 2015 data-taking will be shown.