研究者情報 | 神奈川大学

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
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 S_ππ = -1.21_-0.27^+0.38(stat)_-0.13^+0.16(syst) and A_ππ = +0.94_-0.31^+0.25(stat)±0.09(syst).