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オクノ ショウジ
Okuno Shoji 奥野 祥二 所属 神奈川大学 情報学部 システム数理学科 職種 助教 |
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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. |