Journal
PHYSICS LETTERS B
Volume 647, Issue 2-3, Pages 67-73Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2007.01.068
Keywords
leptonic; B decay
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We present a search for the decays B+ -> mu(+)nu(mu) and B+ -> e(+)nu(e) in a 253 fb(-1) data sample collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy B factory. We find no significant evidence for a signal and set 90% confidence level upper limits of B(B+ ->mu(+)nu(mu)) < 1.7 x 10(-6) and B(B+ -> e(+)nu(e)) < 9.8 x 10(-7). (c) 2007 Elsevier B.V. All rights reserved.
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