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)
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.