オクノ ショウジ   Okuno Shoji
  奥野 祥二
   所属   神奈川大学  工学部 情報システム創成学科
   職種   助教
言語種別 日本語
発行・発表の年月 2001/04
形態種別 学術雑誌
標題 Measurement of Bd0!-{B}d0! mixing rate from the time evolution of dilepton events at the υ(4S)
執筆形態 共著
掲載誌名 Physical Review Letters:Volume86,Issue15
巻・号・頁 3228-3232頁
概要 K.Abe, S.Okuno, et al.[Belle Collaboration],

We report a determination of the Bd0!-{B}d0! mixing parameter δmd based on the time evolution ofdilepton yields in υ(4S)decays.The measurement is based on a 5.9 fb-1data sample collected by the Belle detector at KEKB.The proper-time difference destributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing δmd as a free parameter.Using both muons and electrons,we obtain δmd = 0.463±.008(stat)±.016(syst) ps-1. This is the first determination of δmd from time evolution measurements at the υ(4S).We also place limits on possible CPT violations.