Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 43: Bottom-Produktion I

T 43.5: Talk

Monday, March 28, 2011, 17:45–18:00, 30.35: 040

Study of the Reference Channel B⁺ → J/ψ K⁺ for the Search of the Rare Decay B_s → µµ in ATLAS^∗ — Peter Buchholz, •Bakul Gaur, Kai Grybel, Valentin Sipica, and Wolfgang Walkowiak — University of Siegen

The decay of B_s → µ⁺µ⁻ is strongly suppressed in the Standard Model (SM). SM extensions, however, predict its branching fraction enhanced by several orders of magnitude higher than the SM prediction (∼ 3.6 · 10⁻⁹). Thus, B_s → µµ is an interesting channel for discovering New Physics at the LHC.

The measurement of the branching fraction of B_s → µ⁺µ⁻ requires a good understanding of acceptances and selection efficiencies. It is measured relative to a reference channel, B⁺ → J/ψ K⁺, in order to cancel out most systematic uncertainties. The status of the study of the reference channel with pp collision data at √s=7 TeV is presented.

^∗ Supported by BMBF