Search for the CP-violating decays Υ(4S)→B0B̄0→J/ ψKS0+J/ψ(ηc)KS0

O. Tajima, M. Hazumi, I. Adachi, H. Aihara, V. Aulchenko, T. Aushev, A. M. Bakich, E. Barberio, A. Bay, I. Bedny, V. Bhardwaj, U. Bitenc, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, P. Chang, A. Chen, K. F. Chen, W. T. ChenB. G. Cheon, C. C. Chiang, R. Chistov, I. S. Cho, Y. Choi, Y. K. Choi, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S. Eidelman, D. Epifanov, A. Go, G. Gokhroo, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, D. Heffernan, T. Hokuue, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Ikado, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, N. J. Joshi, D. H. Kah, H. Kaji, J. H. Kang, S. U. Kataoka, H. Kawai, T. Kawasaki, H. Kichimi, H. J. Kim, H. O. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, S. Korpar, P. Krian, P. Krokovny, R. Kumar, C. C. Kuo, Y. J. Kwon, J. S. Lange, J. S. Lee, M. J. Lee, S. E. Lee, T. Lesiak, J. Li, S. W. Lin, D. Liventsev, F. Mandl, D. Marlow, S. McOnie, T. Medvedeva, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, D. Mohapatra, Y. Nagasaka, E. Nakano, M. Nakao, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, H. Ozaki, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, R. Pestotnik, L. E. Piilonen, H. Sahoo, Y. Sakai, O. Schneider, A. Sekiya, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, H. Shibuya, J. G. Shiu, B. Shwartz, J. B. Singh, A. Sokolov, A. Somov, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, F. Takasaki, M. Tanaka, G. N. Taylor, Y. Teramoto, K. Trabelsi, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. E. Varvell, K. Vervink, S. Villa, A. Vinokurova, C. C. Wang, C. H. Wang, M. Z. Wang, P. Wang, Y. Watanabe, R. Wedd, E. Won, B. D. Yabsley, A. Yamaguchi, Y. Yamashita, M. Yamauchi, C. Z. Yuan, Y. Yusa, C. C. Zhang, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We report the first search for CP-violating decays of the Υ(4S) using a data sample that contains 535×106 Υ(4S) mesons with the Belle detector at the KEKB asymmetric-energy e+e- collider. A partial reconstruction technique is employed to enhance the signal sensitivity. No significant signals were observed. We obtain an upper limit of 4×10-7 at the 90% confidence level for the branching fractions of the CP violating modes, Υ(4S)→B0B̄0→J/ψKS0+J/ψ(ηc)KS0. Extrapolating the result, we find that an observation with 5σ significance is expected with a 30ab-1 data sample, which is within the reach of a future super B factory.

Original languageEnglish (US)
Article number211601
JournalPhysical review letters
Volume99
Issue number21
DOIs
StatePublished - Nov 20 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Tajima, O., Hazumi, M., Adachi, I., Aihara, H., Aulchenko, V., Aushev, T., Bakich, A. M., Barberio, E., Bay, A., Bedny, I., Bhardwaj, V., Bitenc, U., Bozek, A., Bračko, M., Browder, T. E., Chang, M. C., Chang, P., Chen, A., Chen, K. F., ... Zupanc, A. (2007). Search for the CP-violating decays Υ(4S)→B0B̄0→J/ ψKS0+J/ψ(ηc)KS0. Physical review letters, 99(21), [211601]. https://doi.org/10.1103/PhysRevLett.99.211601