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arXiv · 1503.05613

Measurement of the branching fraction of B^+ -> tau^+ nu_tau decays with the semileptonic tagging method

Belle Collaboration·B. Kronenbitter·M. Heck·P. Goldenzweig·T. Kuhr·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·K. Arinstein·D. M. Asner·T. Aushev·R. Ayad·T. Aziz·A. M. Bakich·V. Bansal·E. Barberio·V. Bhardwaj·A. Bondar·G. Bonvicini·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·R. Chistov·K. Cho·V. Chobanova·Y. Choi·D. Cinabro·J. Dalseno·M. Danilov·J. Dingfelder·Z. Doležal·Z. Drásal·A. Drutskoy·D. Dutta·S. Eidelman·D. Epifanov·H. Farhat·J. E. Fast·T. Ferber·O. Frost·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·D. Getzkow·R. Gillard·R. Glattauer·B. Golob·J. Grygier·K. Hayasaka·H. Hayashii·X. H. He·M. Heider·A. Heller·T. Horiguchi·M. Huschle·T. Iijima·K. Inami·A. Ishikawa·R. Itoh·Y. Iwasaki·I. Jaegle·K. K. Joo·T. Julius·K. H. Kang·E. Kato·D. Y. Kim·H. J. Kim·J. B. Kim·J. H. Kim·K. T. Kim·M. J. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·B. R. Ko·P. Kodyš·P. Križan·P. Krokovny·A. Kuzmin·Y. -J. Kwon·J. S. Lange·D. H. Lee·I. S. Lee·P. Lewis·L. Li Gioi·J. Libby·D. Liventsev·P. Lukin·D. Matvienko·H. Miyata·R. Mizuk·G. B. Mohanty·S. Mohanty
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Abstract

We report a measurement of the branching fraction of B^+ -> tau^+ nu_tau decays using a data sample of 772 x 10^6 BBbar pairs, collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We reconstruct the accompanying B meson in a semileptonic decay and detect the recoiling B candidate in the decay channel B^+ -> tau^+ nu_tau. We obtain a branching fraction of BR(B^+ -> tau^+ nu_tau) = [1.25 +- 0.28 (stat.) +- 0.27 (syst.)] x 10^-4. This result is in good agreement with previous measurements and the expectation from the calculation based on the Standard Model.

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Belle Collaboration, B. Kronenbitter, M. Heck, P. Goldenzweig, T. Kuhr, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, T. Aushev, R. Ayad, T. Aziz, A. M. Bakich, V. Bansal, E. Barberio, V. Bhardwaj, A. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, J. Dingfelder, Z. Doležal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, O. Frost, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, D. Getzkow, R. Gillard, R. Glattauer, B. Golob, J. Grygier, K. Hayasaka, H. Hayashii, X. H. He, M. Heider, A. Heller, T. Horiguchi, M. Huschle, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, K. K. Joo, T. Julius, K. H. Kang, E. Kato, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, P. Križan, P. Krokovny, A. Kuzmin, Y. -J. Kwon, J. S. Lange, D. H. Lee, I. S. Lee, P. Lewis, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, S. Mohanty. 2015-03-18. Measurement of the branching fraction of B^+ -> tau^+ nu_tau decays with the semileptonic tagging method. https://arxiv.org/abs/1503.05613

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