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

Abstract : We report the first observation of the baryonic flavor-changing neutral current decay Λb0→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 6.8fb-1 at s=1.96TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for Λb0→Λμ+μ- are measured. We find B(Λb0→Λμ+μ-)=[1.73±0.42(stat)±(syst)]×10-6. We also report the first measurement of the differential branching ratio of Bs0→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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Journal articles
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http://hal.in2p3.fr/in2p3-00618358
Contributor : Swarna Bassava <>
Submitted on : Thursday, September 1, 2011 - 3:04:15 PM
Last modification on : Friday, October 30, 2020 - 12:04:02 PM

### Citation

T. Aaltonen, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, et al.. Observation of the Baryonic Flavor-Changing Neutral Current Decay Λb0→Λμ+μ-. Physical Review Letters, American Physical Society, 2011, 107, pp.201802. ⟨10.1103/PHYSREVLETT.107.201802⟩. ⟨in2p3-00618358⟩

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