Search for B^0 -> l^+ l^- at Belle

Details Search for B^0 -> l^+ l^- at Belle Search for B^0 -> l^+ l^- at Belle

2003-09-24

arxiv.org/abs/hep-ex/0309069v3

Phys.Rev.D68:111101,2003

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 1 figure, submitted to Phys. Rev. D (RC)

Scientific paper

10.1103/PhysRevD.68.111101

We report the results of a search for the decay B^0 -> e^+ e^-, mu^+ mu^- and e^{+-} mu^{-+} based on an analysis of 78 fb^{-1} of data collected by the Belle detector at KEKB. No candidate events have been found. Upper limits on the branching fractions are calculated at the 90% confidence level: B(B^0 -> e^+ e^-) < 1.9 x 10^{-7}, B(B^0 -> mu^+ mu^-) < 1.6 x 10^{-7}, and B(B^0 -> e^{+-} mu^{-+})< 1.7 x 10^{-7}. A limit on the Pati-Salam leptoquark mass M_{LQ}> 46 TeV/c^2 is obtained at the 90% confidence level.

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