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First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation

  • H. Sahoo
  • , T. E. Browder
  • , I. Adachi
  • , D. M. Asner
  • , V. Aulchenko
  • , A. M. Bakich
  • , E. Barberio
  • , K. Belous
  • , V. Bhardwaj
  • , B. Bhuyan
  • , A. Bondar
  • , A. Bozek
  • , M. Bračko
  • , O. Brovchenko
  • , A. Chen
  • , P. Chen
  • , B. G. Cheon
  • , K. Cho
  • , Y. Choi
  • , J. Dalseno
  • Z. Doleal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, V. Gaur, N. Gabyshev, J. Haba, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, N. J. Joshi, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Koblitz, P. Kody, S. Korpar, P. Krian, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. J. Kwon, J. S. Lange, M. J. Lee, S. H. Lee, J. Li, Y. Li, J. Libby, C. L. Lim, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, T. Mori, M. Nakao, Z. Natkaniec, C. Ng, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, T. Peng, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Prim, M. Röhrken, S. Ryu, K. Sakai, Y. Sakai, T. Sanuki, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, G. Varner, A. Vinokurova, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, Y. Yamashita, C. Z. Yuan, Y. Yusa, C. C. Zhang, Z. P. Zhang, V. Zhilich, P. Zhou, V. Zhulanov, A. Zupanc
  • University of Hawai'i at Mānoa
  • High Energy Accelerator Research Organization, Tsukuba
  • Pacific Northwest National Laboratory
  • RAS - Budker Institute of Nuclear Physics
  • Novosibirsk State University
  • The University of Sydney
  • University of Melbourne
  • Institute for High Energy Physics
  • Panjab University
  • Indian Institute of Technology Guwahati
  • H. Niewodniczanski Institute of Nuclear Physics
  • Jožef Stefan Institute
  • University of Maribor
  • Karlsruhe Institute of Technology
  • National Central University
  • National Taiwan University
  • Hanyang University
  • Korea Institute of Science and Technology Information
  • Sungkyunkwan University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • Technische Universität München
  • Charles University
  • Tata Institute of Fundamental Research
  • Nagoya University
  • Nara Women's University
  • Tohoku University
  • Tohoku Gakuin University
  • Kyungpook National University
  • Yonsei University
  • Niigata University
  • Korea University
  • Seoul National University
  • University of Cincinnati
  • Research Center for Nuclear Physics
  • Institute of Science Tokyo
  • University of Ljubljana
  • Tokyo Metropolitan University
  • Justus Liebig University Giessen
  • Virginia Polytechnic Institute and State University
  • Indian Institute of Technology Madras
  • CAS - Institute of High Energy Physics
  • Alikhanov Institute for Theoretical and Experimental Physics
  • Swiss Federal Institute of Technology Lausanne
  • The University of Tokyo
  • Tokyo University of Agriculture and Technology
  • Kanagawa University
  • University of Science and Technology of China
  • Austrian Academy of Sciences
  • University of Nova Gorica
  • Gifu University
  • Saga University
  • Osaka Metropolitan University
  • Nippon Dental University
  • Wayne State University

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report the first observation of the radiative decay B0→· K0γ using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0→·K0γ)= (2.74±0.60±0.32)×10-6, where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S ·KS0γ=+0.74-1.05+0.72(stat)-0.24+0.10(syst) and A ·KS0γ=+0.35±0.58(stat)-0.10+0.23(syst). Furthermore, we measure B(B+→·K+γ)=(2. 48±0.30±0.24)×10-6, ACP=-0. 03±0.11±0.08, and find that the signal is concentrated in the M·K mass region near threshold.

Original languageEnglish
Article number071101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume84
Issue number7
DOIs
StatePublished - 6 Oct 2011

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