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 pp̅ 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 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 B(s)0→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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Updated: Thursday, 2012 January 26 15:24:48 CST automatically from input from "Stephanie A. Schuler"