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 2001/08
形態種別 学術雑誌
標題 Observation of Large CP Violation in the Neutral B Meson System
執筆形態 共著
掲載誌名 Physical Review Letters:Volume87, 091802, 7pages(2001)
概要 K. Abe, S. Okuno, et al. [Belle Collaboration] ,
We present a measurement of the standard model CP violation parameter sin2φ1 based on a 29.1fb-1 data sample collected at the υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is fully reconstructed as a J/ψKS, ψ(2S)KS, χc1KS, ηcKS, J/ψKL, or J/ψK*0 decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2φ1 = 0.99 ± 0.14 (stat) ± 0.06 (syst). We conclude that we have observed CP violation in the neutral B meson system.