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research article
Evidence of the purely leptonic decay B-→τ-ν̄τ
We present the first evidence of the decay B-→τ-ν̄τ, using 414fb-1 of data collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be B(B-→τ-ν̄τ)=(1.79-0.49+0.56(stat) -0.51+0.46(syst))×10-4. This implies that fB=0.229-0.031+0.036(stat)-0. 037+0.034(syst)GeV and is the first direct measurement of this quantity. © 2006 The American Physical Society.
Type
research article
Web of Science ID
WOS:000243414600012
Scopus ID
2-s2.0-33845790610
Authors
Ikado, K.
•
Abe, K.
•
Adachi, I.
•
Aihara, H.
•
Akai, K.
•
Akemoto, M.
•
Anipko, D.
•
Arinstein, K.
•
Aulchenko, V.
•
Aushev, T.
Publication date
2006
Published in
Volume
97
Issue
25
Article Number
251802
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
November 5, 2010
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