Karlsruhe 2011 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 53: Supersymmetrie III

T 53.2: Vortrag

Mittwoch, 30. März 2011, 17:00–17:15, 30.22: 021

(contribution withdrawn) Detection prospects of the model with Non-Universal Higgs Masses, gaugino mediation and ν̃_τ as NLSP in ATLAS — •Judita Mamuzic — DESY

Supersymmetric models with conserved R-parity, masses in the GeV range and G̃ dark matter have a χ̃₁⁰ and a charged l̃ as a NLSP, but can be excluded due to the strong constrains from the Big Bang Nucleosynthesis. For SUSY breaking with gaugino mediation the NLSP is the ν̃ and it has viable regions where its primordial abundance satisfies the BBN constrains. Typical models of SUSY breaking with universal scalar and gaugino masses have l̃_R lighter than the l̃_L and ν̃. However, for models with non-universal SUSY breaking parameters at the high scale, especially for m_H1²−m_H2²>0, that mass order is different, and the NLSP can be ν̃. This results in cascade SUSY event with a slightly different topology, characterized by lots of soft leptons and jets and much lower turn-on of QCD production for a given center of mass energy. The benchmark analysis for 7 TeV and integrated luminosity of 1 fb⁻¹ applied on Monte Carlo data has not given a high enough significance. Therefore, optimization has been performed using Multi Variate Analyses methods (Boosted Decision Trees and Cuts method using Genetic Algorithm), which seems promising in achieving significance higher than 5 sigma.