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Observation of B
Chang, Y-Y; Wang, M-Z; Abdesselam, A; Adachi, I; Adamczyk, K; Aihara, H; Al Said, S; Asner, D M; Atmacan, H; Aushev, T; Babu, V; Badhrees, I; Bakich, A M; Barberio, E; Bhuyan, B; Biswal, J; Bobrov, A; Bozek, A; Bracko, M; Browder, T E; Cervenkov, D; Chekelian, V; Chen, A; Cheon, B G; Chilikin, K; Chistov, R; Chobanova, V; Choi, S-K; Choi, Y; Cinabro, D; Dalseno, J; Danilov, M; Dingfelder, J; Dolezal, Z; Drásal, Z; Dutta, D; Eidelman, S; Farhat, H; Fast, J E; Ferber, T; Fulsom, B G; Gaur, V; Gabyshev, N; Ganguly, S; Garmash, A; Gillard, R; Glattauer, R; Goh, Y M; Goldenzweig, P; Greenwald, D.
Afiliación
  • Chang YY; Department of Physics, National Taiwan University, Taipei 10617.
  • Wang MZ; Department of Physics, National Taiwan University, Taipei 10617.
  • Abdesselam A; Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
  • Adachi I; SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
  • Adamczyk K; High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
  • Aihara H; H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
  • Al Said S; Department of Physics, University of Tokyo, Tokyo 113-0033.
  • Asner DM; Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589.
  • Atmacan H; Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
  • Aushev T; Pacific Northwest National Laboratory, Richland, Washington 99352.
  • Babu V; Middle East Technical University, 06531 Ankara.
  • Badhrees I; Institute for Theoretical and Experimental Physics, Moscow 117218.
  • Bakich AM; Moscow Institute of Physics and Technology, Moscow Region 141700.
  • Barberio E; Tata Institute of Fundamental Research, Mumbai 400005.
  • Bhuyan B; King Abdulaziz City for Science and Technology, Riyadh 11442.
  • Biswal J; Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
  • Bobrov A; School of Physics, University of Sydney, NSW 2006.
  • Bozek A; School of Physics, University of Melbourne, Victoria 3010.
  • Bracko M; Indian Institute of Technology Guwahati, Assam 781039.
  • Browder TE; J. Stefan Institute, 1000 Ljubljana.
  • Cervenkov D; Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
  • Chekelian V; Novosibirsk State University, Novosibirsk 630090.
  • Chen A; H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
  • Cheon BG; J. Stefan Institute, 1000 Ljubljana.
  • Chilikin K; University of Maribor, 2000 Maribor.
  • Chistov R; University of Hawaii, Honolulu, Hawaii 96822.
  • Chobanova V; Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
  • Choi SK; Max-Planck-Institut für Physik, 80805 München.
  • Choi Y; National Central University, Chung-li 32054.
  • Cinabro D; Hanyang University, Seoul 133-791.
  • Dalseno J; Institute for Theoretical and Experimental Physics, Moscow 117218.
  • Danilov M; Institute for Theoretical and Experimental Physics, Moscow 117218.
  • Dingfelder J; Max-Planck-Institut für Physik, 80805 München.
  • Dolezal Z; Gyeongsang National University, Chinju 660-701.
  • Drásal Z; Sungkyunkwan University, Suwon 440-746.
  • Dutta D; Wayne State University, Detroit, Michigan 48202.
  • Eidelman S; Max-Planck-Institut für Physik, 80805 München.
  • Farhat H; Excellence Cluster Universe, Technische Universität München, 85748 Garching.
  • Fast JE; Institute for Theoretical and Experimental Physics, Moscow 117218.
  • Ferber T; Moscow Physical Engineering Institute, Moscow 115409.
  • Fulsom BG; University of Bonn, 53115 Bonn.
  • Gaur V; Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
  • Gabyshev N; Faculty of Mathematics and Physics, Charles University, 121 16 Prague.
  • Ganguly S; Tata Institute of Fundamental Research, Mumbai 400005.
  • Garmash A; Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
  • Gillard R; Novosibirsk State University, Novosibirsk 630090.
  • Glattauer R; Wayne State University, Detroit, Michigan 48202.
  • Goh YM; Pacific Northwest National Laboratory, Richland, Washington 99352.
  • Goldenzweig P; Deutsches Elektronen-Synchrotron, 22607 Hamburg.
  • Greenwald D; Pacific Northwest National Laboratory, Richland, Washington 99352.
Phys Rev Lett ; 115(22): 221803, 2015 Nov 27.
Article en En | MEDLINE | ID: mdl-26650291
ABSTRACT
We report the first observation of the decays B^{0}→pΛ[over ¯]D^{(*)-}. The data sample of 711 fb^{-1} used in this analysis corresponds to 772×10^{6} BB[over ¯] pairs, collected at the ϒ(4S) resonance by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B^{0}→pΛ[over ¯]D^{-} and B^{0}→pΛ[over ¯]D^{*-} to be (25.1±2.6±3.5)×10^{-6} and (33.6±6.3±4.4)×10^{-6}, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (pΛ[over ¯]) system is observed, consistent with that observed in similar B decays.
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Banco de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Año: 2015 Tipo del documento: Article
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Banco de datos: MEDLINE Tipo de estudio: Prognostic_studies Idioma: En Año: 2015 Tipo del documento: Article