Measurement of the time-dependent CP-violating asymmetry in BO→KSOπOγ decays

Y. Ushiroda, K. Sumisawa, M. Hazumi, K. Abe, K. Abe, I. Adachi, H. Aihara, Y. Asano, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bay, I. Bedny, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. Bračko, J. BrodzickaT. E. Browder, M. C. Chang, P. Chang, Y. Chao, A. Chen, K. F. Chen, W. T. Chen, B. G. Cheon, S. K. Choi, Y. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Danilov, M. Dash, J. Dragic, S. Eidelman, F. Fang, S. Fratina, N. Gabyshev, T. Gershon, G. Gokhroo, A. Gorišek, J. Haba, K. Hara, N. C. Hastings, K. Hayasaka, H. Hayashii, T. Higuchi, L. Hinz, T. Hokuue, Y. Hoshi, S. Hou, W. S. Hou, Y. B. Hsiung, T. Iijima, A. Imoto, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwasaki, Y. Iwasaki, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, T. Kawasaki, H. R. Khan, H. Kichimi, H. J. Kim, S. M. Kim, K. Kinoshita, P. Križan, P. Krokovny, S. Kumar, C. C. Kuo, A. Kusaka, A. Kuzmin, Y. J. Kwon, G. Leder, T. Lesiak, J. Li, A. Limosani, S. W. Lin, D. Liventsev, F. Mandl, T. Matsumoto, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, D. Mohapatra, G. R. Moloney, T. Nagamine, E. Nakano, M. Nakao, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, N. Parslow, L. S. Peak, R. Pestotnik, L. E. Piilonen, H. Sagawa, Y. Sakai, N. Sato, T. Schietinger, O. Schneider, A. J. Schwartz, K. Senyo, M. E. Sevior, T. Shibata, H. Shibuya, J. B. Singh, A. Somov, N. Soni, R. Stamen, S. Stanič, M. Starič, T. Sumiyoshi, S. Suzuki, O. Tajima, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, Y. Teramoto, X. C. Tian, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, T. Uglov, S. Uno, P. Urquijo, G. Varner, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. Watanabe, Y. Watanabe, Q. L. Xie, A. Yamaguchi, Y. Yamashita, M. Yamauchi, Heyoung Yang, J. Ying, J. Zhang, L. M. Zhang, Z. P. Zhang, D. Žontar

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Abstract

We present a new measurement of CP-violation parameters in B0→KS0π0γ decay based on a sample of 275×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. One of the B mesons is fully reconstructed in the B0→KS0π0γ decay. The flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distribution of the proper time intervals between the two B decays. We obtain SKS0π0γ=-0.58-0.38+0.46(stat)±0.11(syst) and AKS0π0γ=+0.03±0.34(stat)±0.11(syst), for the KS0π0 invariant mass covering the full range up to 1.8GeV/c2. We also measure the CP-violation parameters for the case B0→K*0(→KS0π0)γ and obtain SK*0γ=-0.79-0.50+0.63(stat)±0.10(syst) for AK*0γ fixed at 0.

Original languageEnglish
Article number231601
JournalPhysical review letters
Volume94
Issue number23
DOIs
Publication statusPublished - 2005 Jun 17

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Ushiroda, Y., Sumisawa, K., Hazumi, M., Abe, K., Abe, K., Adachi, I., Aihara, H., Asano, Y., Aulchenko, V., Aushev, T., Bakich, A. M., Bay, A., Bedny, I., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., Bračko, M., ... Žontar, D. (2005). Measurement of the time-dependent CP-violating asymmetry in BO→KSOπOγ decays. Physical review letters, 94(23), [231601]. https://doi.org/10.1103/PhysRevLett.94.231601