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Evidence for semileptonic B-→ pp̄ℓ- ν̄ℓ decays

  • K. J. Tien
  • , M. Z. Wang
  • , I. Adachi
  • , H. Aihara
  • , D. M. Asner
  • , V. Aulchenko
  • , T. Aushev
  • , A. M. Bakich
  • , A. Bala
  • , B. Bhuyan
  • , A. Bozek
  • , M. Bračko
  • , T. E. Browder
  • , P. Chang
  • , V. Chekelian
  • , A. Chen
  • , P. Chen
  • , B. G. Cheon
  • , K. Chilikin
  • , R. Chistov
  • I. S. Cho, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Doležal, Z. Drásal, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, V. Gaur, S. Ganguly, R. Gillard, Y. M. Goh, B. Golob, J. Haba, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, M. Huschle, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Julius, D. H. Kah, J. H. Kang, E. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, Y. J. Kim, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, B. Kronenbitter, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Lee, J. Li, Y. Li, J. Libby, C. Liu, Y. Liu, D. Liventsev, P. Lukin, K. Miyabayashi, H. Miyata, G. B. Mohanty, A. Moll, R. Mussa, E. Nakano, M. Nakao, Z. Natkaniec, M. Nayak, E. Nedelkovska, C. Ng, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, S. Okuno, S. L. Olsen, W. Ostrowicz, C. Oswald, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, D. Santel, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, T. A. Shibata, J. G. Shiu, A. Sibidanov, Y. S. Sohn, A. Sokolov, S. Stanič, M. Starič, M. Steder, M. Sumihama, T. Sumiyoshi, K. Tanida, G. Tatishvili, Y. Teramoto, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, M. N. Wagner, C. H. Wang, P. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, Y. Yamashita, S. Yashchenko, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc
  • National Taiwan University
  • High Energy Accelerator Research Organization, Tsukuba
  • The University of Tokyo
  • Pacific Northwest National Laboratory
  • Novosibirsk State University
  • Alikhanov Institute for Theoretical and Experimental Physics
  • The University of Sydney
  • Panjab University
  • Indian Institute of Technology Guwahati
  • H. Niewodniczanski Institute of Nuclear Physics
  • Jožef Stefan Institute
  • University of Maribor
  • University of Hawai'i at Mānoa
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • National Central University
  • Hanyang University
  • Yonsei University
  • Korea Institute of Science and Technology Information
  • Sungkyunkwan University
  • Wayne State University
  • Technische Universität München
  • Moscow Engineering Physics Institute
  • Charles University
  • German Electron Synchrotron
  • Tata Institute of Fundamental Research
  • University of Ljubljana
  • Nara Women's University
  • Nagoya University
  • Tohoku Gakuin University
  • Karlsruhe Institute of Technology
  • Kyungpook National University
  • Tohoku University
  • University of Melbourne
  • Niigata University
  • Soongsil University
  • Korea University
  • Tokyo Metropolitan University
  • Seoul National University
  • Virginia Polytechnic Institute and State University
  • Indian Institute of Technology Madras
  • University of Science and Technology of China
  • University of Cincinnati
  • National Institute for Nuclear Physics
  • Osaka Metropolitan University
  • Tokyo University of Agriculture and Technology
  • Toho University
  • Kanagawa University
  • University of Bonn
  • Luther College, Decorah
  • University of Pittsburgh
  • Swiss Federal Institute of Technology Lausanne
  • University of the Basque Country
  • Ikerbasque Basque Foundation for Science
  • Austrian Academy of Sciences
  • Justus Liebig University Giessen
  • Yamagata University
  • Institute for High Energy Physics
  • Institute of Science Tokyo
  • University of Nova Gorica
  • Gifu University
  • Moscow Institute of Physics and Technology
  • National United University Taiwan
  • CAS - Institute of High Energy Physics
  • Nippon Dental University

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We find evidence for the semileptonic baryonic decay B-→pp̄ℓ- ν̄ℓ (ℓ=e, μ), based on a data sample of 772 million BB̄ pairs collected at the Ï (4S) resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. A neural-network based hadronic B-meson tagging method is used in this study. The branching fraction of B-→pp̄ℓ-ν̄ℓ is measured to be (5.8-2.1+2.4(stat) ±0.9(syst))×10-6 with a significance of 3.2σ, where lepton universality is assumed. We also estimate the corresponding upper limit: B(B-→pp̄ℓ-ν̄ℓ)<9.6×10-6 at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays.

Original languageEnglish
Article number011101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume89
Issue number1
DOIs
StatePublished - 9 Jan 2014

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