Heidelberg 2007 – scientific programme

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T: Fachverband Teilchenphysik

T 411: Schwere Quarks III

T 411.4: Talk

Thursday, March 8, 2007, 17:40–17:55, INF 327 SR 1

Search for the rare decay B_s → µ⁺ µ⁻ — •Ralf Bernhard — Universität Freiburg, Freiburg, Deutschland

An experimental upper limit is presented for a search for the rare flavour changing neutral current decay B_s → µ⁺ µ⁻. A data set with integrated luminosity of up to 2 fb⁻¹ of proton-antiproton collisions at √s=1.96 TeV collected with the DØ detector in RunII of the Fermilab Tevatron collider is used. The decay mode B_s → µ⁺ µ⁻ is particularly sensitive to supersymmetric extensions of the Standard Model. Therefore the obtained upper limit is a powerful input variable to constrain these models. For example In models where the lightest supersymmetric particle is considered to be a dark matter candidate the limit aids in restricting the dark matter scattering cross section on nucleons.