M. -C. Chang
Published 2003-09-24, updated 2003-10-21Version 3
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.
Comments: 8 pages, 1 figure, submitted to Phys. Rev. D (RC)
Journal: Phys.Rev.D68:111101,2003
Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle
Observation of the decay $B_s^0\to J/ψη$ and Evidence for $B_s^0\to J/ψη'$
Measurements of exclusive B_s^0 decays at the Y(5S) resonance
