Search for B+ -> mu+ nu and B+ -> l+ nu gamma decays
K. Abe
Abstract
We have searched for the leptonic and radiative leptonic B decays, B+ -> mu+ nu, B+ -> e+ nu gamma and B+ -> mu+ nu gamma. Using a 140 fb-1 data sample collected with the Belle detector at the KEKB asymmetric e+ e- collider, we find no evidence for signals in any mode and set the following preliminary upper limits at 90% confidence level: BR(B+ -> mu+ nu) < 2.0 * 10-6, BR(B+ -> e+ nu gamma) < 2.2 * 10-5, and BR(B+ -> mu+ nu gamma) < 2.3 * 10-5.
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