Search for Decays of B^{0} Mesons into Pairs of Leptons: B{0} -> e^{+}e^{-}, B^{0} -> μ^{+}μ^{-} and B^{0} -> e^{\pm}μ^{\mp}

Abstract

We search for the decays of the $B^0$ meson into $e^{+}{e}^{-}$, ${\mu }^{+}{\mu }^{-}$ $e^{\pm }{\mu }^{\mp }$ pairs in a sample of $9.7\times 10^6$ $B\bar{B}$ pairs recorded by CLEO detector. No signal is found, and the following upper limits on the corresponding branching fractions are established: $<8.3\times 10^{-7}$, $<6.1\times 10^{-7}$, $<15\times 10^{-7}$ at 90% confidence level. A new lower limit on the Pati-Salam leptoquark mass $M_{LQ}>27$ TeV is established at 90% confidence level.

10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS

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• Constraints on R-parity violating supersymmetry from leptonic and semileptonic tau, B_d and B_s decays
• Search for the Decays $B_{(s)}^0\to e^{+}{\mu }^{-}$ and $B_{(s)}^0\to e^{+}{e}^{-}$ in CDF Run II
• Search for B^0 -> l^+ l^- at Belle
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• Study of B0 --> l+l'- decays (l,l' = e,mu)
• Search for decays of B0 mesons into pairs of charged leptons: B0->e+e-, B0->mu+mu-, B0->e+-mu-+
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• Search for the Decays B0->e+e-gamma and B0->mu+mu-gamma
• Heavy quark production via supersymmetric interaction at a neutrino factory