Evidence for B{sup -{yields}{tau}-{nu}}{sub {tau}}with a semileptonic tagging method

Journal Article · Fri Oct 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.071101· OSTI ID:21421331

Hara, K; Iijima, T; Hayasaka, K; Inami, K; Miyazaki, Y; Mori, T; Ohshima, T; Senyo, K ^[1]; Aihara, H ^[2]; Aulchenko, V; Bondar, A; Eidelman, S; Gabyshev, N; Kuzmin, A; Shwartz, B; Zhilich, V; Zyukova, O ^[3]; Aushev, T ^[4]; Aziz, T; Mohanty, G B ^[5]

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1. Nagoya University, Nagoya (Japan)
2. Department of Physics, University of Tokyo, Tokyo (Japan)
3. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
4. Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne (Switzerland)
5. Tata Institute of Fundamental Research, Mumbai (India)

We present a measurement of the decay B{sup -{yields}{tau}-{nu}}{sub {tau}}using a data sample containing 657x10{sup 6} BB pairs collected at the {Upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. A sample of B{sup +}B{sup -} pairs are tagged by reconstructing one B{sup +} meson decaying semileptonically. We detect the B{sup -{yields}{tau}-{nu}}{sub {tau}}candidate in the recoil. We obtain a signal with a significance of 3.6 standard deviations including systematic uncertainties, and measure the branching fraction to be B(B{sup -{yields}{tau}-{nu}}{sub {tau}})=[1.54{sub -0.37}{sup +0.38}(stat){sub -0.31}{sup +0.29}(syst)]x10{sup -4}. This result confirms the evidence for B{sup -{yields}{tau}-{nu}}{sub {tau}}obtained in a previous Belle measurement that used a hadronic B tagging method.

• OSTI ID: 21421331
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 7; Other Information: DOI: 10.1103/PhysRevD.82.071101; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MINUS MESONS
B PLUS MESONS
BRANCHING RATIO
MESONS
PARTICLE DECAY
RESONANCE
SEMILEPTONIC DECAY
TAU NEUTRINOS
TAU PARTICLES
B MESONS
BEAUTY MESONS
BEAUTY PARTICLES
BOSONS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HEAVY LEPTONS
LEPTONS
MASSLESS PARTICLES
NEUTRINOS
PSEUDOSCALAR MESONS
WEAK PARTICLE DECAY