Evidence for B-→τ-ν̄τ with a semileptonic tagging method

Evidence for B-→τ-ν̄τ with a semileptonic tagging method

We present a measurement of the decay B-→τ -ν̄τ using a data sample containing 657×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of B+B- pairs are tagged by reconstructing one B+ meson decaying semileptonically. We detect...

Täydet tiedot

Bibliografiset tiedot
Päätekijät: Hara, K, Iijima, T, Aihara, H, Aulchenko, V, Aushev, T, Aziz, T, Bakich, A, Barberio, E, Belous, K, Bischofberger, M, Bondar, A, Bozek, A, Bračko, M, Browder, T, Chang, P, Chao, Y, Chen, A, Cheon, BG, Chiang, C, Cho, I, Choi, Y, Dalseno, J, Danilov, M, Doležal, Z, Dungel, W
Aineistotyyppi: Journal article
Kieli:English
Julkaistu: 2010
Kuvaus
Yhteenveto:We present a measurement of the decay B-→τ -ν̄τ using a data sample containing 657×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of B+B- pairs are tagged by reconstructing one B+ meson decaying semileptonically. We detect the B-→τ -ν̄τ 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-→τ -ν̄τ)=[1.54-0.37+0.38(stat)-0.31+0.29(syst)] ×10-4. This result confirms the evidence for B -→τ-ν̄τ obtained in a previous Belle measurement that used a hadronic B tagging method. © 2010 The American Physical Society.

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