München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 47: Supersymmetrie 3

T 47.6: Talk

Wednesday, March 11, 2009, 18:00–18:15, Audimax

The ATLAS discovery potential for a charged slepton as next-to-lightest supersymmetric particle — •Valentina Ferrara — DESY, Zeuthen

Supersymmetric models with conserved R-parity require the lightest supersymmetric particle (LSP) to be stable. This means that, if neutral, the LSP may provide a good candidate for (cold) dark matter (DM). The most popular LSP candidate is the lightest neutralino, a particle already present in minimal supersymmetric extension of the Standard Model (MSSM). However, new possibilities arise if one considers particles which are not part of the MSSM such as the axino, the spin1/2 superpartner of the axion, and the gravitino, the spin-3/2 superpartner of the graviton. Both the axino and the gravitino allow a long-lived charged slepton to be the next-to-lightest SUSY particle (NLSP): the stau τ, i.e. the superpartner of the tau lepton. Being also weakly-interacting and penetrating, the stau will escape the hadronic calorimeters of the ATLAS detector and will appear as a track in the muon system. It will therefore look like and reconstructed as a slow-moving massive muon. A direct consequence of R-parity conservation is that we expect exactly two of such tracks per event. The discovery potential of the ATLAS detector is investigated for different values of the parameters of the SUSY model.