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 2002/10
形態種別 学術雑誌
標題 Measurement of CP-Violating Parameters in B → η K Decays
執筆形態 共著
掲載誌名 Phys.Lett.B546(2002)
巻・号・頁 196-205頁
概要 K.F.Chen,K.Hara,S.Okuno,et al.[Belle Collaboration],We present measurements of CP-violating parameters in B0(B0) → η KS0 and B± → η' K± decays based on a 41.8 fb-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(B0) → η KS0 CP eigenstate and identify the flavor of the accompanying B from its decay products. From the distribution of time intervals between pairs of B meson decay points, we obtain the CP-violating asymmetry parameters Sη KS0 = 0.28±0.55(stat)+0.07-0.08(syst), and Aη KS0 = 0.13±0.32(stat)+0.09-0.06(syst). We also reconstruct charged B± → η K± decays and determine a direct-CP violating asymmetry value of Aη K±=(-1.5±7.0(stat)±0.9(syst))%.