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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2012, vol. 108, p. -

Precise measurement of the CP violation parameter sin2 1 in B0→(cc̄)K0 decays

Adachi I., Aihara H., Asner D. M., Aulchenko V., Aushev T., Aziz T., Bakich A. M., Bay A., Bhardwaj V., Bhuyan B., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chen P., Cheon B. G., Chilikin K., Chistov R., Cho K., Choi S. K., Choi Y., Dalseno J., Danilov M., Doleal Z., Drásal Z., Eidelman S., Epifanov D., Fast J. E., Gaur V., Gabyshev N., Garmash A., Goh Y. M., Golob B., Haba J., Hara K., Hara T., Hayasaka K., Hayashii H., Higuchi T., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwabuchi M., Iwasaki Y., Iwashita T., Julius T., Kapusta P., Katayama N., Kawasaki T., Kichimi H., Kiesling C., Kim H. J., Kim H. O., Kim J. B., Kim J. H., Kim K. T., Kim Y. J., Kinoshita K., Ko B. R., Koblitz S., Kody P., Korpar S., Krian P., Krokovny P., Kuhr T., Kumar R., Kumita T., Kuzmin A., Kwon Y. J., Lange J. S., Lee S. H., Li J., Li Y., Liu C., Liu Y., Liu Z. Q., Liventsev D., Louvot R., Matvienko D., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Mohanty G. B., Mori T., Muramatsu N., Nakano E.

We present a precise measurement of the CP violation parameter sin2 1 and the direct CP violation parameter A f using the final data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. One neutral B meson is reconstructed in a J/ψKS0, ψ(2S)KS0, χ c1KS0, or J/ψKL0 CP eigenstate and its flavor is identified from the decay products of the accompanying B meson. From the distribution of proper-time intervals between the two B decays, we obtain the following CP violation parameters: sin2 1=0.667±0. 023(stat)±0.012(syst) and A f=0.006±0.016(stat) ±0.012(syst). © 2012 American Physical Society.