The decay search for the lepton-flavor-violatng leptonic B decays such as B 0 → μ ∓τ ∓ and B 0 → e ∓τ ∓ was investigated. The decay modes are found to be forbidden in the conventional standard model by the lepton-flavor conservation law. The Monte Carlo simulation was used to determine the efficiency for detecting the signal modes. It was observed that the leptonic B decays were generated with the τ lepton unpolarized. The results show that there was no indication of a signal, and upper limits on the branching fractions were also obtained.
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We gratefully acknowledge the effort of the CESR staff in providing us with excellent luminosity and running conditions. This work was supported by the National Science Foundation, the U.S. Department of Energy, the Research Corporation, and the Texas Advanced Research Program.