Observation of B decays to two kaons

S. W. Lin, P. Chang, K. Abe, K. Abe, I. Adachi, H. Aihara, D. Anipko, K. Arinstein, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, E. Barberio, A. Bay, I. Bedny, K. Belous, U. Bitenc, I. Bizjak, S. Blyth, A. BondarA. Bozek, M. Bračko, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, J. Dalseno, M. Dash, J. Dragic, S. Eidelman, S. Fratina, N. Gabyshev, T. Gershon, A. Go, G. Gokhroo, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, D. Heffernan, Y. Hoshi, S. Hou, W. S. Hou, Y. B. Hsiung, T. Iijima, K. Ikado, A. Imoto, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kaji, J. H. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, Y. J. Kim, K. Kinoshita, S. Korpar, P. Križan, R. Kulasiri, C. C. Kuo, Y. J. Kwon, J. S. Lange, J. Lee, M. J. Lee, S. E. Lee, T. Lesiak, A. Limosani, F. Mandl, T. Matsumoto, S. McOnie, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, D. Mohapatra, T. Mori, I. Nakamura, E. Nakano, M. Nakao, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, K. S. Park, R. Pestotnik, L. E. Piilonen, H. Sahoo, Y. Sakai, N. Satoyama, T. Schietinger, O. Schneider, J. Schümann, A. J. Schwartz, K. Senyo, M. Shapkin, J. B. Singh, A. Sokolov, A. Somov, N. Soni, S. Stanič, M. Starič, H. Stoeck, T. Sumiyoshi, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, I. Tikhomirov, K. Trabelsi, T. Tsukamoto, S. Uehara, T. Uglov, K. Ueno, Y. Unno, S. Uno, Y. Usov, G. Varner, S. Villa, C. C. Wang, C. H. Wang, M. Z. Wang, Y. Watanabe, E. Won, Q. L. Xie, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, C. C. Zhang, L. M. Zhang, Z. P. Zhang, V. Zhilich, A. Zupanc

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Abstract

Using 449×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we observe clear signals for B+→K̄0K+ and B0→K̄0K0 decays with 5.3σ and 6.0σ significance, respectively. We measure the branching fractions B(B+→K̄0K+)=(1.22-0.28-0.16+0.32+0.13)×10-6 and B(B0→K̄0K0)=(0.87-0.20+0.25±0.09)×10-6, and partial-rate asymmetries ACP(B+→K̄0K+)=0.13-0.24+0.23±0.02 and ACP(B0→K̄0K0)=-0.58-0.66+0.73±0.04. From a simultaneous fit, we also obtain B(B+→K0π+)=(22.8-0.7+0.8±1.3)×10-6 and ACP(B+→K0π+)=0.03±0.03±0.01. The first and second error in the branching fractions and the partial-rate asymmetries are statistical and systematic, respectively. No signal is observed for B0→K+K- decays, and for this branching fraction, we set an upper limit of 4.1×10-7 at the 90% confidence level.

Original languageEnglish
Article number181804
JournalPhysical review letters
Volume98
Issue number18
DOIs
Publication statusPublished - 2007 May 4

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Lin, S. W., Chang, P., Abe, K., Abe, K., Adachi, I., Aihara, H., Anipko, D., Arinstein, K., Aulchenko, V., Aushev, T., Aziz, T., Bakich, A. M., Barberio, E., Bay, A., Bedny, I., Belous, K., Bitenc, U., Bizjak, I., Blyth, S., ... Zupanc, A. (2007). Observation of B decays to two kaons. Physical review letters, 98(18), [181804]. https://doi.org/10.1103/PhysRevLett.98.181804