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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2003, vol. 67, p. -

Studies of B 0-B̄ 0 mixing properties with inclusive dilepton events

Hastings N. C., Abe K., Abe K., Abe R., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Ban Y., Banas E., Bay A., Bedny I., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Casey B. C K, Chang M. C., Chang P., Chao Y., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Choi Y. K., Danilov M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Enari Y., Everton C. W., Fang F., Fukunaga C., Gabyshev N., Garmash A., Gershon T., Golob B., Haba J., Hagner C., Handa F., Hara T., Hasuko K., Hayashii H., Hazumi M., Higuchi I., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Hsiung Y. B., Huang H. C., Igaki T., Igarashi Y., Lijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki Y., Jang H. K., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawai H., Kawasaki T., Kichimi H., Kim D. W., Kim H. J., Kim H. O., Kim Hyunwoo, Kim J. H., Kim S. K., Kinoshita K., Kobayashi S., Korpar S., Križan P., Krokovny P., Kulasiri R., Kumar S., Kuzmin A., Kwon Y. J., Lange J. S., Leder G.

We report a precise determination of the Z 0-B̄ 0 mixing parameter Δm d based on the time evolution of same-sign and opposite-sign dilepton yields in Y(45) decays. Data were collected with the Belle detector at KEKB. Using data samples of 29.4 fb -1 recorded at the γ(4S) resonance and 3.0 fb -1 recorded at an energy 60 MeV below the resonance, we measure Δm d=[0.503±0.008(stat) ±0.010(syst)] ps -1. From the same analysis, we also measure the ratio of charged and neutral B meson production at the γ(4S), f +/f 0= 1-01 ±0.03(stat)±0.09(syst), and CPT violation parameters in B 0-B̄ 0 mixing, (cos θ)=0.00±0.12(stat) ±0.01(syst) and ℑ(cos θ)=0.03±0.01(stat)±0.03(syst). © 2003 The American Physical Society.