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Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 -> Λμ+μ

CollaborationWith : Clark, Allan Geoffrey / Garcia Navarro, Jose Enrique / Lister, Alison / Wu, Xin
Published in Physical Review Letters. 2011, vol. 107, no. 20, p. 201802
Abstract We report the first observation of the baryonic flavor-changing neutral current decay Λ0b→Λμ+μ− with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a pp collisions data sample corresponding to 6.8  fb−1 at s√=1.96  TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Λ0b→Λμ+μ− are measured. We find B(Λ0b→Λμ+μ−)=[1.73±0.42(stat)±(syst)]×10−6. We also report the first measurement of the differential branching ratio of B0s→ϕμ+μ−, using 49 signal events. In addition, we report branching ratios for B+→K+μ+μ−, B0→K0μ+μ−, and B→K∗(892)μ+μ− decays.
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CDF COLLABORATION. Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0 -> Λμ+μ. In: Physical Review Letters, 2011, vol. 107, n° 20, p. 201802. https://archive-ouverte.unige.ch/unige:38753

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Deposited on : 2014-07-21

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