x / 01 07 06 1 v 2 1 A ug 2 00 1 BELLE KEK preprint 2001 - 50 Belle preprint 2001 - 10 Observation of Large CP Violation in the Neutral B Meson System
نویسندگان
چکیده
We present a measurement of the Standard Model CP violation parameter sin 2φ1 based on a 29.1 fb −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 sin 2φ1 = 0.99 ± 0.14(stat) ± 0.06(syst). We conclude that we have observed CP violation in the neutral B meson system. PACS numbers:11.30.Er,12.15.Hh,13.25.Hw Typeset using REVTEX
منابع مشابه
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تاریخ انتشار 2001