Search for B0 -> l+ l- at Belle
Abstract
We report the results of a search for the decay B0 -> 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(B0 -> e+ e-) < 1.9 x 10-7, B(B0 -> mu+ mu-) < 1.6 x 10-7, and B(B0 -> e+- mu-+)< 1.7 x 10-7. A limit on the Pati-Salam leptoquark mass MLQ> 46 TeV/c2 is obtained at the 90% confidence level.
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