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2015•arXiv (Cornell University)Open access

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

B. Kronenbitter, M. Heck, P. Goldenzweig, T. Kuhr, A. Abdesselam, Ichiro Adachi, H. Aihara, S. Al Said, K. Arinstein, David M. Asner, T. Aushev, R. Ayad, T. Aziz, A. M. Bakich, V. Bansal, E. L. Barberio, Vishal Bhardwaj, A. Bondar, G. Bonvicini, Andrzej Bozek, M. Bračko, Thomas E. Browder, D. Červenkov, Vladimir Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, Jeremy Peter Dalseno, M. Danilov, J. Dingfelder, Z. Doležal, Zbyněk 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, Alexey Garmash, D. Getzkow, Roland Gillard, R. Glattauer, B. Golob, J. Grygier, K. Hayasaka, Hisaki Hayashii, X. H. He, M. Heider, A. Heller, T. Horiguchi, M. Huschle, Toru Iijima, K. Inami, A. Ishikawa, R. Itoh, M. 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, Young‐June Kim, K. Kinoshita, B. R. Ko, P. Kodyš, P. Križan, P. Krokovny, Aleksei Vladimirovich Kuzmin, Y.-J. Kwon, Jens Sören Lange, D. H. Lee, I. S. Lee, Peter M. Lewis, L. Li Gioi, James Frederick Libby, Dmitri Liventsev, P. Lukin, Dmitry V. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, Sachi Nandan Mohanty, A. Moll, H. K. Moon, R. Mussa, E. Nakano, Marcelo Nakao, T. Nanut, Z. Natkaniec, M. Nayak, N. K. Nisar, Shohei Nishida, S. Okuno, S. L. Olsen, Waclaw Ostrowicz, C. Oswald, Pavel N. Pakhlov, G. Pakhlova, H. Park, T. K. Pedlar, L. Pesántez, R. Pestotnik, M. Petrič, L. E. Piilonen, C. Pulvermacher, E. Ribežl, Martin Ritter, Armine Rostomyan, Seunghwa Ryu, Y. Sakai, Luka Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, M. Schram, Christoph Schwanda, Katsumi Senyo, O. Seon, Martin E. Sevior, V. Shebalin, T.-A. Shibata, J.-G. Shiu, B. Shwartz, A. Sibidanov, Frank Simon, Y.-S. Sohn, A. Sokolov, Elena Solovieva, Samo Stanič, Marko Starič, M. Steder, Takayuki Sumiyoshi, Umberto Tamponi, Y. Teramoto, Karim Trabelsi, Makoto Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, C. Van Hulse, P. Vanhoefer, Gary S. Varner, A. Vinokurova, A. Vossen, Mathias Wagner, C. H. Wang, M.-Z. Wang, P. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, H. Yamamoto, S. Yashchenko, Y. Yook, Z. P. Zhang, V. N. Zhilich, Vladimir V. Zhulanov, M. Ziegler, Anže Zupanc

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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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What this paper is about

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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Available 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.

Key concepts: KEKB, Physics, Branching fraction, Particle physics, B meson, Collider, Electron–positron annihilation, Resonance (particle physics)

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