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 2002/08
形態種別 学術雑誌
標題 Study of CP-Violating Asymmetries in B0 → π+π- Decays
執筆形態 共著
掲載誌名 Phys.Rev.Lett.89,071801(2002)(6pages)
概要 K.Abe,S.Okuno,et al.[Belle Collaboration],We present a measurement of CP-violating asymmetries in B0 → π+π- decays based on a 41.8fb-1 data sample collected at the υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson as a B0 → π+π- CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters Sππ = -1.21-0.27+0.38(stat)-0.13+0.16(syst) and Aππ = +0.94-0.31+0.25(stat)±0.09(syst).