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Measurement of the moments of the photon energy spectrum in B→Xsγ decays and determination of |Vcb| and mb at Belle

  • C. Schwanda
  • , P. Urquijo
  • , E. Barberio
  • , A. Limosani
  • , I. Adachi
  • , H. Aihara
  • , K. Arinstein
  • , T. Aushev
  • , S. Bahinipati
  • , A. M. Bakich
  • , V. Balagura
  • , I. Bedny
  • , K. Belous
  • , U. Bitenc
  • , A. Bondar
  • , A. Bozek
  • , M. Bračko
  • , M. C. Chang
  • , A. Chen
  • , W. T. Chen
  • B. G. Cheon, R. Chistov, I. S. Cho, Y. Choi, J. Dalseno, M. Dash, A. Drutskoy, S. Eidelman, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, Y. Hoshi, W. S. Hou, H. J. Hyun, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, D. H. Kah, J. H. Kang, P. Kapusta, N. Katayama, H. Kichimi, H. J. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, Y. Kozakai, P. Križan, P. Krokovny, R. Kumar, C. C. Kuo, Y. Kuroki, A. Kuzmin, Y. J. Kwon, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, C. Liu, D. Liventsev, F. Mandl, A. Matyja, S. McOnie, T. Medvedeva, W. Mitaroff, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. R. Moloney, E. Nakano, M. Nakao, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, P. Pakhlov, G. Pakhlova, H. Palka, C. W. Park, H. Park, L. S. Peak, R. Pestotnik, L. E. Piilonen, H. Sahoo, Y. Sakai, O. Schneider, J. Schümann, R. Seidl, A. Sekiya, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, J. G. Shiu, B. Shwartz, A. Somov, S. Stanič, M. Starič, T. Sumiyoshi, F. Takasaki, M. Tanaka, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, S. Uehara, Y. Unno, S. Uno, G. Varner, K. E. Varvell, K. Vervink, S. Villa, C. H. Wang, P. Wang, Y. Watanabe, R. Wedd, E. Won, B. D. Yabsley, H. Yamamoto, Y. Yamashita, Z. P. Zhang, A. Zupanc
  • Institut für Hochenergiephysik
  • University of Melbourne
  • High Energy Accelerator Research Organization (KEK)
  • University of Tokyo
  • Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
  • Institute for Theoretical and Experimental Physics
  • ENAC-IIC-GEL
  • University of Cincinnati
  • University of Sydney
  • Kurchatov Institute
  • Department of Biochemistry and Molecular and Structural Biology
  • Institute for Nuclear Physics
  • University of Maribor
  • Fu Jen Catholic University
  • National Central University
  • Hanyang University
  • Yonsei University
  • Sungkyunkwan University
  • Virginia Polytechnic Institute and State University
  • University of Ljubljana
  • Korea University
  • Osaka University
  • Nagoya University
  • Nara Women's University
  • Tohoku Gakuin University
  • National Taiwan University
  • Kyungpook National University
  • Saga University
  • Tokyo Institute of Technology
  • The Graduate University for Advanced Studies
  • Panjab University
  • Seoul National University
  • University of Hawaii
  • University of Science and Technology of China
  • Niigata University
  • Osaka City University
  • Tokyo University of Agriculture and Technology
  • Toho University
  • Kanagawa University
  • University of Illinois at Urbana-Champaign
  • Riken BNL Research Center
  • University of Nova Gorica
  • Tokyo Metropolitan University
  • National United University Taiwan
  • Institute of High Energy Physics, Chinese Academy of Sciences
  • Tohoku University
  • Nippon Dental University

Research output: Contribution to journalArticlepeer-review

Abstract

Using the previous Belle measurement of the inclusive photon energy in B→Xsγ decays, we determine the first and second moments of this spectrum for minimum photon energies in the B meson rest frame ranging from 1.8 to 2.3 GeV. Combining these measurements with recent Belle data on the lepton energy and hadronic mass moments in B→Xcℓν decays, we perform fits to theoretical expressions derived in the 1S and kinetic mass schemes and extract the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb, the b-quark mass, and other nonperturbative parameters. In the 1S scheme analysis we find |Vcb|=(41.56±0.68(fit)±0.08(τB))×10-3 and mb1S=(4.723±0.055)GeV. In the kinetic scheme, we obtain |Vcb|=(41.58±0.69(fit)±0.08(τB)±0.58(th))×10-3 and mbkin=(4.543±0.075)GeV.

Original languageEnglish
Article number032016
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume78
Issue number3
DOIs
Publication statusPublished - 27 Aug 2008
Externally publishedYes

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