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

Journal Article · Fri Dec 22 00:00:00 EST 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.251802· OSTI ID:20861513

Ikado, K; Hayasaka, K; Hokuue, T; Iijima, T; Inami, K; Miyazaki, Y; Ohshima, T; Okabe, T; Senyo, K ^[1]; Abe, K; Adachi, I; Akai, K; Akemoto, M; Flanagan, J; Furukawa, K; Gershon, T; Haba, J; Hara, K; Hazumi, M; Iida, N ^[2]

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1. Nagoya University, Nagoya (Japan)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

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.

• OSTI ID: 20861513
• Journal Information: Physical Review Letters, Vol. 97, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.97.251802; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MINUS MESONS
BRANCHING RATIO
GEV RANGE 01-10
LEPTONIC DECAY
TAU NEUTRINOS
TAU PARTICLES