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 2003/05
形態種別 学術雑誌
査読 査読あり
標題 Measurement of the B0-{B}0 mixing rate with B0({B}0)→ D*∓π± partial reconstruction
執筆形態 共著
掲載誌名 Phys. Rev. D 67,092004 (2003) (14 pages)
著者・共著者 Y. Zheng, T. E. Browder,
S.Okuno, et al. [BELLE Collaboration],
概要 Y. Zheng, T. E. Browder,
S.Okuno, et al. [BELLE Collaboration],
We report a measurement of the B0-B0 mixing parameter δ md based on a 29.1 fb-1 sample of υ(4S) resonance decays collected by the Belle detector at the KEKB asymmetric e+ e- collider. We use events with a partially reconstructed B0({B}0)→ D*∓π± candidate and where the flavor of the accompanying B meson is identified by the charge of the lepton from a B0({B}0)→ XL±ν decay. The proper-time difference between the two B mesons is determined from the distance between the two decay vertices. From a simultaneous fit to the proper-time distributions for the same-flavor (B0({B}0),L±) and opposite-flavor (B0({B}0),L) event samples, we measure the mass difference between the two mass eigenstates of the neutral B meson to be δ md = (0.509±0.017 (stat)±0.020 (syst)) ps-1.