Evidence of the Purely Leptonic Decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}

We present the first evidence of the decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}, using 414 fb{sup -1} of data collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. Events are tagged by fully reconstructing one of the B mesons...

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Bibliographic Details
Published in:Physical review letters 2006-12, Vol.97 (25)
Main Authors: Ikado, K., Hayasaka, K., Hokuue, T., Iijima, T., Inami, K., Miyazaki, Y., Ohshima, T., Okabe, T., Senyo, K., Abe, K., Adachi, I., Akai, K., Akemoto, M., Flanagan, J., Furukawa, K., Gershon, T., Haba, J., Hara, K., Hazumi, M., Iida, N.
Format: Article
Language:English
Subjects:
ASYMMETRY
B MINUS MESONS
BRANCHING RATIO
GEV RANGE 01-10
LEPTONIC DECAY
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
TAU NEUTRINOS
TAU PARTICLES
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Summary:We present the first evidence of the decay B{sup -}{yields}{tau}{sup -}{nu}{sub {tau}}, using 414 fb{sup -1} of data collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} 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{sup -}{yields}{tau}{sup -}{nu}{sub {tau}})=(1.79{sub -0.49}{sup +0.56}(stat){sub -0.51}{sup +0.4=} 6(syst))x10{sup -4}. This implies that f{sub B}=0.229{sub -0.031}{sup +0.036}(stat){sub -0.037}{sup +0.034}(syst) GeV and is the first direct measurement of this quantity.
ISSN:0031-9007
1079-7114
DOI:10.1103/PHYSREVLETT.97.251802