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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 71, p. 1-12

Improved measurement of CP-violation parameters sin 2φ 1 and |λ|, B meson lifetimes, and B 0-B̄ 0 mixing parameter Δm d

Abe K., Abe K., Adachi I., Aihara H., Akatsu M., Asano Y., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Ban Y., Banerjee S., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Eiges V., Fang F., Fratina S., Gabyshev N., Garmash A., Gershon T., Go A., Gokhroo G., Golob B., Haba J., Hara K., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Higuchi I., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Imoto A., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki Y., Kakuno H., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim J. H., Kim S. K., Kim S. M., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kuo C. C., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Lesiak T., Li J., Lin S. W., Liventsev D., MacNaughton J.

We present a precise measurement of the standard model CP-violation parameter sin2φ 1, the direct CP violation parameter |λ|, the lifetimes of charged and neutral B mesons and their ratio, and the B 0-B̄ 0 mixing parameter Δm d based on a sample of 152 x 10 6 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e +e - collider. One of two B mesons is fully reconstructed in a CP-eigenstate or a flavor-eigenstate decay channel. The flavor of the accompanying B meson is identified from its decay products. From the distributions of the time interval between the two B meson decay points, we obtain sin2φ 1 = 0.728 ± 0.056(stat) ± 0.023(syst), |λ| = 1.007 ± 0.041(stat) ± 0.033(syst), τ B0 = [1.534 ± 0.008(stat) ± 0.010(syst)] ps, τ B+ = [1.635 ± 0.011(stat) ± 0.011(syst)] ps, τ B+/ τ B0 = 1.066 ± 0.008(stat) ± 0.008(syst) and Δm d = [0.511 ± 0.005(stat) ± 0.006(syst) ps -1. The results for sin2φ 1 and |λ| are consistent with the standard model expectations. The significance of the observed deviation from unity in the lifetime ratio exceeds 5 standard deviations. © 2005 The American Physical Society.