Improved measurement of the partial-rate CP asymmetry in B +→K 0π + and B -→K̄ 0π - decays

Y. Unno, K. Suzuki, K. Abe, K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, S. Bahinipati, A. M. Bakich, Y. Ban, S. Banerjee, A. Bay, I. Bedny, P. K. Behera, I. BizjakA. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C.K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S. K. Choi, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, F. Fang, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, R. Guo, J. Haba, F. Handa, H. Hayashii, M. Hazumi, L. Hinz, T. Hokuue, Y. Hoshi, W. S. Hou, H. C. Huang, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, H. J. Kim, Hyunwoo Kim, J. H. Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, 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, A. Limosani, S. W. Lin, D. Liventsev, J. MacNaughton, F. Mandl, D. Marlow, H. Matsumoto, T. Matsumoto

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Abstract

We report an improved measurement of the partial-rate CP asymmetry in B ±→K 0π ± decays. The analysis is based on a data sample of 85×10 6 BB̄ pairs collected at the Y(4S) resonance with the Belle detector at the KEKB e +e - storage ring. We measure A CP(K 0π ±) = 0.07- 0.08 +0.09 +0.03 +0.01, where the first and second errors are statistical and systematic, respectively; the corresponding 90% confidence-level interval is -0.10 <A CP(K 0π ±) <0.22.

Original languageEnglish
Article number011103
JournalPhysical Review D
Volume68
Issue number1
DOIs
Publication statusPublished - 2003 Jul

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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