Measurement of CP-violating parameters in B → η′ K decays

K. F. Chen, K. Hara, K. Abe, K. Abe, T. Abe, I. Adachi, S. A. Byoung, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, A. Bay, I. Bedny, P. K. Behera, I. Bizjak, A. BondarA. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, J. Dragic, S. Eidelman, V. Eiges, Y. Enari, F. Fang, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, R. Guo, J. Haba, K. Hanagaki, F. Handa, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, L. Hinz, Y. Hoshi, W. S. Hou, Y. B. Hsiung, S. C. Hsu, H. C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, H. Kichimi, D. W. Kim, K. Heejong, H. J. Kim, K. Hyunwoo, T. H. Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y. J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, R. S. Lu, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, T. Matsuishi, S. Matsumoto, T. Matsumoto, K. Miyabayashi, Y. Miyabayashi, H. Miyata, G. R. Moloney, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, S. Noguchi, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, H. Palka, C. W. Park, H. Park, L. S. Peak, J. P. Perroud, M. Peters, L. E. Piilonen, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, J. B. Singh, N. Soni, S. Stanic, M. Starič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S. Y. Suzuki, T. Takahashi, F. Takasaki, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, K. Trabelsi, W. Trischuk, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M. Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, P. Yeh, M. Yokoyama, Y. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, D. Žontar

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Abstract

We present measurements of CP-violating parameters in B0(B0) → η′ KS0 and B± → η′ K± decays based on a 41.8 fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson as a B0(B0) → η′ KS0 CP eigenstate and identify the flavor of the accompanying B from its decay products. From the distribution of proper time intervals between pairs of B meson decay points, we obtain the CP-violating asymmetry parameters Sη′ KS0 = 0.28 ± 0.55(stat)-0.08+0.07(syst), and Aη′ KS0 = 0.13 ± 0.32(stat)-0.06+0.09(syst). We also reconstruct charged B± → η′ K± decays and determine a direct-CP-violating asymmetry value of Aη′ K± = (-1.5 ± 7.0(stat) ± 0.9(syst))%.

Original languageEnglish (US)
Pages (from-to)196-205
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume546
Issue number3-4
DOIs
StatePublished - Oct 24 2002

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Keywords

  • B decays
  • CP violations

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    Chen, K. F., Hara, K., Abe, K., Abe, K., Abe, T., Adachi, I., Byoung, S. A., Aihara, H., Akatsu, M., Asano, Y., Aso, T., Aulchenko, V., Aushev, T., Bakich, A. M., Ban, Y., Bay, A., Bedny, I., Behera, P. K., Bizjak, I., ... Žontar, D. (2002). Measurement of CP-violating parameters in B → η′ K decays. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 546(3-4), 196-205. https://doi.org/10.1016/S0370-2693(02)02389-4