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	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 m_d 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)→ X^∓L^±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 m_d = (0.509±0.017 (stat)±0.020 (syst)) ps^-1.