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Satoyama, N.,Abe, K.,Adachi, I.,Aihara, H.,Anipko, D.,Bakich, A.M.,Barberio, E.,Bedny, I.,Belous, K.,Bitenc, U.,Bizjak, I.,Bondar, A.,Bozek, A.,Brač,ko, M.,Browder, T.E.,Chang, M.-C.,Chang, P.,Ch Elsevier 2007 Physics letters: B Vol.647 No.2
<P><B>Abstract</B></P><P>We present a search for the decays <SUP>B+</SUP>→<SUP>μ+</SUP><SUB>νμ</SUB> and <SUP>B+</SUP>→<SUP>e+</SUP><SUB>νe</SUB> in a 253 fb<SUP>−1</SUP> data sample collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy <I>B</I> factory. We find no significant evidence for a signal and set 90% confidence level upper limits of B(<SUP>B+</SUP>→<SUP>μ+</SUP><SUB>νμ</SUB>)<1.7×<SUP>10−6</SUP> and B(<SUP>B+</SUP>→<SUP>e+</SUP><SUB>νe</SUB>)<9.8×<SUP>10−7</SUP>.</P>