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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2001, vol. 86, p. 3228-3232

Measurement of Bd/0-B̄d/0 mixing rate from the time evolution of dilepton events at the Υ(4S)

Abe K., Abe K., Adachi I., Ahn B. S., Aihara H., Akatsu M., Alimonti G., Aoki K., Asai K., Asai M., Asano Y., Aso T., Aulchenko V., Aushev T., Bakich A. M., Banas E., Behari S., Behera P. K., Beiline D., Bondar A., Bozek A., Browder T. E., Casey B. C K, Chang P., Chao Y., Cheon B. G., Choi S. K., Choi Y., Doi Y., Dragic J., Eidelman S., Enari Y., Enomoto R., Everton C. W., Fang F., Fujii H., Fujita Y., Fukunaga C., Fukushima M., Garmash A., Gordon A., Gotow K., Guler H., Guo R., Haba J., Haji T., Hamasaki H., Hanagaki K., Handa F., Hara K., Hara T., Hastings N. C., Hayashi K., Hayashii H., Hazumi M., Heenan E. M., Higuchi I., Higuchi T., Hirai T., Hirano H., Hojo T., Hoshi Y., Hou W. S., Hsu S. C., Huang H. C., Huang Y. C., Ichizawa S., Igarashi Y., Iijima T., Ikeda H., Ikeda K., Inami K., Inoue Y., Ishikawa A., Ishino H., Itoh R., Iwai G., Iwasaki H., Iwasaki Y., Jackson D. J., Jalocha P., Jang H. K., Jones M., Kagan R., Kakuno H., Kaneko J., Kang J. H., Kang J. S., Kapusta P., Kasami K., Katayama N., Kawai H., Kawai M., Kawamura N., Kawasaki T., Kichimi H., Kim D. W., Kim Heejong

The mixing parameteer based on the time evolution of dilepton yields was determined in Y (4S) decays. The measurement was based on a data sample collected by the Belle detector. The proper-time distributions for same-sign and opposite-sign dilepton events aere simultaneously fitted on an analytical expression. Both muons and electrons were used in the experiments.