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Measurement of the form factors of the decay B0→D⊃* -+ν and determination of the CKM matrix element |Vcb|

  • W. Dungel
  • , C. Schwanda
  • , I. Adachi
  • , H. Aihara
  • , T. Aushev
  • , T. Aziz
  • , A. M. Bakich
  • , V. Balagura
  • , E. Barberio
  • , M. Bischofberger
  • , A. Bozek
  • , M. Bračko
  • , T. E. Browder
  • , P. Chang
  • , Y. Chao
  • , A. Chen
  • , P. Chen
  • , B. G. Cheon
  • , R. Chistov
  • , I. S. Cho
  • K. Cho, K. S. Choi, Y. Choi, J. Dalseno, A. Drutskoy, S. Eidelman, H. Ha, J. Haba, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, T. Iijima, K. Inami, M. Iwabuchi, Y. Iwasaki, N. J. Joshi, T. Julius, J. H. Kang, T. Kawasaki, H. J. Kim, H. O. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Križan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, M. J. Lee, S. H. Lee, J. Li, A. Limosani, C. Liu, Y. Liu, D. Liventsev, R. Louvot, A. Matyja, S. McOnie, H. Miyata, R. Mizuk, G. B. Mohanty, T. Mori, E. Nakano, M. Nakao, Z. Natkaniec, S. Neubauer, S. Nishida, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, G. Pakhlova, C. W. Park, H. Park, H. K. Park, M. Petrič, L. E. Piilonen, M. Prim, M. Röhrken, M. Rozanska, S. Ryu, H. Sahoo, K. Sakai, Y. Sakai, O. Schneider, A. J. Schwartz, K. Senyo, M. E. Sevior, J. G. Shiu, J. B. Singh, P. Smerkol, A. Sokolov, S. Stanič, M. Starič, T. Sumiyoshi, S. Suzuki, S. Tanaka, G. N. Taylor, Y. Teramoto, K. Trabelsi, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, G. Varner, K. E. Varvell, K. Vervink, C. H. Wang, P. Wang, M. Watanabe, Y. Watanabe, R. Wedd, K. M. Williams, E. Won, Y. Yamashita, D. Zander, Z. P. Zhang, P. Zhou, V. Zhulanov, T. Zivko
  • Institut für Hochenergiephysik
  • High Energy Accelerator Research Organization (KEK)
  • University of Tokyo
  • Institute for Theoretical and Experimental Physics
  • ENAC-IIC-GEL
  • Tata Institute of Fundamental Research, Mumbai
  • University of Sydney
  • University of Melbourne
  • Nara Women's University
  • Institute for Nuclear Physics
  • Department of Biochemistry and Molecular and Structural Biology
  • University of Maribor
  • University of Hawaii
  • National Taiwan University
  • National Central University
  • Hanyang University
  • Yonsei University
  • Korea Institute of Science and Technology Information
  • Sungkyunkwan University
  • Max-Planck-Institut für Physik
  • Technische Universität München
  • University of Cincinnati
  • Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
  • Novosibirsk State University
  • Korea University
  • Tohoku University
  • Tohoku Gakuin University
  • Nagoya University
  • Niigata University
  • Kyungpook National University
  • The Graduate University for Advanced Studies
  • University of Ljubljana
  • Institute of Meteorology and Climate Research
  • Tokyo Metropolitan University
  • Seoul National University
  • University of Science and Technology of China
  • Osaka City University
  • Tokyo University of Agriculture and Technology
  • Kanagawa University
  • Virginia Polytechnic Institute and State University
  • Panjab University
  • Kurchatov Institute
  • University of Nova Gorica
  • Saga University
  • National United University Taiwan
  • Institute of High Energy Physics, Chinese Academy of Sciences
  • Nippon Dental University
  • Wayne State University

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Résumé

This article describes a determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| from the decay B0→D⊃* -+ν using 711fb-1 of Belle data collected near the Υ(4S) resonance. We simultaneously measure the product of the form factor normalization F(1) and the matrix element |V cb| as well as the three parameters ρ2, R1(1) and R2(1), which determine the form factors of this decay in the framework of the heavy quark effective theory. The results, based on about 120000 reconstructed B0→D⊃* -+ν decays, are ρ2=1.214±0.034±0.009, R1(1)=1.401±0. 034±0.018, R2(1)=0.864±0.024±0.008 and F(1)|Vcb|=(34.6±0.2±1.0)×10-3. The branching fraction of B0→D⊃* -+ν is measured at the same time; we obtain a value of B(B0→D⊃* -+ν)=(4.58±0.03±0. 26)%. The errors correspond to the statistical and systematic uncertainties. These results give the most precise determination of the form factor parameters and F(1)|Vcb| to date. In addition, a direct, model-independent determination of the form factor shapes has been carried out.

langue originaleAnglais
Numéro d'article112007
journalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume82
Numéro de publication11
Les DOIs
étatPublié - 30 déc. 2010
Modification externeOui

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