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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2002, vol. 66, p. -

Improved measurement of mixing-induced CP violation in the neutral B meson system

Abe K., Abe K., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Banas E., Bay A., Behera P. K., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Casey B. C K, Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi Y., Choi Y. K., Danilov M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Everton C. W., Fang F., Fujii H., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Gotow K., Guo R., Haba J., Hanagaki K., Handa F., Hara K., Hara T., Harada Y., Hastings N. C., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hinz L., Hojo T., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Igaki T., Igarashi Y., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki H., Iwasaki Y., Jang H. K., Kakuno H., Kaneko J., Kang J. H., Kang J. S., Katayama N., Kawai H., Kawai H., Kawakami Y., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim Heejong, Kim H. J., Kim H. O., Kim Hyunwoo, Kinoshita K., Kobayashi S., Korotushenko K., Korpar S., Križan P., Krokovny P., Kumar S.

We present an improved measurement of the standard model CP violation parameter sin 2φ1 (also known as sin 2β) based on a sample of 85× 106 BB̄ pairs collected at the Y (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in J/ψKS 0, ψ(2S)KS 0, χc1K S 0, ηcKS 0, J/ψ/K*0, or J/ψ/KL 0 CP-eigenstate decay channel and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time interval between the two B meson decay points, we obtain sin 2φ1=0. 719±0.074(stat)±0.035(syst). © 2002 The American Physical Society.