München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 40: Bottom-Quark Produktion 3

T 40.4: Talk

Thursday, March 12, 2009, 17:30–17:45, A119

Studies of Rare Di-muon B Decays at the ATLAS Experiment — •Valentin Sipica, Peter Buchholz, and Wolfgang Walkowiak — Universität Siegen, Fachbereich Physik

B_s⁰ → µ⁺µ⁻ and B_d⁰ → µ⁺µ⁻ decays are allowed in the Standard Model only through one loop penguin or box diagrams, which are very sensitive to Standard Model extensions. Therefore, they are an excellent probe of New Physics effects. The LHC will be an abundant source of B mesons, allowing for the first time the measurement of branching ratios for such decays in similar order as the Standard Model predictions (BR ∼ 10⁻¹⁰ for B_d⁰ → µ⁺µ⁻ and ∼ 10⁻⁹ for B_s⁰ → µ⁺µ⁻).

The strategy for the search of the B_s⁰ → µ⁺µ⁻ decay is presented, with the focus on a cut based analysis. Variables introduced in order to separate signal from background events are discussed and preliminary results are presented using simulated data.