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T: Fachverband Teilchenphysik

T 17: Beyond the Standard Model (Theorie) 4

T 17.8: Vortrag

Mittwoch, 6. März 2013, 18:30–18:45, WIL-A124

SUSY-QCD corrections to (co)annihilation and their impact on the relic density — •Julia Harz¹, Björn Herrmann², Michael Klasen³, Karol Kovařik⁴, and Quentin Le Boulc’h⁵ — ¹Deutsches Elektronen-Synchrotron, Hamburg, Germany — ²Laboratoire d’Annecy de Physique Théorique, Annecy-le-Vieux, France — ³Institute for Theoretical Physics, University of Münster, Germany — ⁴Karlsruhe Institute of Technology, Karlsruhe, Germany — ⁵Laboratoire de Physique Subatomique et de Cosmologie, Grenoble, France

We computed the full O(α_s) supersymmetric QCD corrections for neutralino-stop co-annihilation in the Minimal Supersymmetric Standard Model (MSSM). It will be shown that these annihilation channels are phenomenologically relevant within the so-called phenomenological MSSM, in particular in the light of the observation of a Higgs-like particle with a mass of about 126 GeV at the LHC. Numerical results for the co-annihilation cross sections and the predicted neutralino relic density are presented. It will be demonstrated that the impact of including these corrections on the cosmologically preferred region of parameter space is larger than the current experimental uncertainty from WMAP data.