Abstract
We report the results of a search for the decay B0→e+e−, μ+μ− and e±μ∓ based on an analysis of 78fb−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−)<1.9×10−7, B(B0→μ+μ−)<1.6×10−7, and B(B0→e±μ∓)<1.7×10−7. A limit on the Pati-Salam leptoquark mass MLQ>46TeV/c2 is obtained at the 90% confidence level.Received 24 September 2003DOI:https://doi.org/10.1103/PhysRevD.68.111101©2003 American Physical Society
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