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Measurements of branching fractions and direct CP asymmetries for B→Kπ, B→ππ and B→KK decays

  • Y. T. Duh
  • , T. Y. Wu
  • , P. Chang
  • , G. B. Mohanty
  • , Y. Unno
  • , I. Adachi
  • , H. Aihara
  • , D. M. Asner
  • , V. Aulchenko
  • , T. Aushev
  • , T. Aziz
  • , A. M. Bakich
  • , B. Bhuyan
  • , M. Bischofberger
  • , A. Bondar
  • , G. Bonvicini
  • , A. Bozek
  • , M. Bračko
  • , T. E. Browder
  • , Y. Chao
  • V. Chekelian, A. Chen, P. Chen, B. G. Cheon, R. Chistov, I. S. Cho, K. Cho, V. Chobanova, Y. Choi, Z. Doležal, A. Drutskoy, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, A. Frey, V. Gaur, R. Gillard, Y. M. Goh, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, A. Ishikawa, T. Julius, J. H. Kang, P. Kapusta, T. Kawasaki, H. J. Kim, H. O. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Lee, Y. Li, J. Libby, C. Liu, Y. Liu, K. Miyabayashi, H. Miyata, R. Mizuk, T. Mori, N. Muramatsu, E. Nakano, M. Nakao, C. Ng, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, G. Pakhlova, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Prim, M. Ritter, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, S. Sandilya, D. Santel, Y. Sato, O. Schneider, C. Schwanda, K. Senyo, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, T. Sumiyoshi, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, S. Uehara, S. Uno, P. Vanhoefer, G. Varner, A. Vinokurova, C. H. Wang, M. Z. Wang, M. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, Y. Yamashita, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc
  • National Taiwan University
  • Tata Institute of Fundamental Research
  • Hanyang University
  • High Energy Accelerator Research Organization, Tsukuba
  • The University of Tokyo
  • Pacific Northwest National Laboratory
  • Novosibirsk State University
  • Institute for Theoretical and Experimental Physics
  • The University of Sydney
  • Indian Institute of Technology Guwahati
  • Nara Women's University
  • Wayne State University
  • 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
  • Yonsei University
  • Korea Institute of Science and Technology Information
  • Sungkyunkwan University
  • Charles University
  • University of Göttingen
  • University of Ljubljana
  • Nagoya University
  • Tohoku Gakuin University
  • Kyungpook National University
  • Tohoku University
  • University of Melbourne
  • Niigata University
  • University of Cincinnati
  • Korea University
  • Karlsruhe Institute of Technology
  • Panjab University
  • Tokyo Metropolitan University
  • Virginia Polytechnic Institute and State University
  • Indian Institute of Technology Madras
  • University of Science and Technology of China
  • Osaka Metropolitan University
  • Tokyo University of Agriculture and Technology
  • Toho University
  • Kanagawa University
  • Seoul National University
  • Luther College, Decorah
  • Swiss Federal Institute of Technology Lausanne
  • Institute of High Energy Physics
  • Yamagata University
  • Institute of Science Tokyo
  • Technische Universität München
  • Gifu University
  • National United University Taiwan
  • Nippon Dental University

Research output: Contribution to journalArticlepeer-review

93 Scopus citations

Abstract

We report measurements of the branching fractions and direct CP asymmetries (ACP) for B→Kπ, ππ and KK decays (but not π0π0) based on the final 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 set a 90% confidence-level upper limit for K+K- at 2.0×10-7; all other decays are observed with branching fractions ranging from 10-6 to 10 -5. In the B0/B̄0→K±π â̂ mode, we confirm Belle's previously reported large ACP with a value of -0.069±0.014±0.007 and a significance of 4.4σ. For all other flavor-specific modes, we find A CP values consistent with zero, including ACP(K +π0)=+0.043±0.024±0.007 with 1.8σ significance. The difference of CP asymmetry between B±→ K±π0 and B0/B̄0→K ±πâ̂ is found to be ΔA ≡ACP(K+π0)-ACP(K +π-)=+0.112±0.027±0.007 with 4.0σ significance. We also calculate the ratios of partial widths for the B→Kπ decays. Using our results, we test the validity of the sum rule ACP(K+π-)+ACP(K0π+) Γ(K0π+)Γ(K+π-)-A CP(K+π0)2Γ(K+π0)Γ(K +π-)-ACP(K0π0)2Γ(K0π0) Γ(K+π-)=0 and obtain a sum of -0.270±0.132±0.060 with 1.9σ significance.

Original languageEnglish
Article number031103
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number3
DOIs
StatePublished - 21 Feb 2013

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