B(B → Xse + e − ) < 10.1 × 10 −6,
نویسندگان
چکیده
We report a search for the flavor-changing neutral current decay B → Xsl +l− using a 29.5 fb−1 data sample accumulated at the Υ(4S) resonance with Belle detector at the KEKB e+e− storage ring. We observe evidence for B → Kμ+μ− and report the preliminary branching fraction of B(B → Kμ+μ−) = (0.99 −0.32 +0.13 −0.15)× 10−6. We also set the following 90% confidence level upper limits on the branching fractions for exclusive and inclusive decays, B(B → Ke+e−) < 1.2× 10−6, B(B → K∗(892)e+e−) < 5.1× 10−6, B(B → K∗(892)μ+μ−) < 3.0 × 10−6, B(B → Xsee) < 10.1 × 10−6, B(B → Xsμμ) < 19.1× 10−6. Typeset using REVTEX
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