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CP violation at Belle

The Belle collaboration has observed a large signal for CP violation in Bmeson decays. We used a data set consisting of 29.1fb−1 recorded at the Υ(4S) resonance collected at the KEKB asymmetric e+e− collider. The data set includes 31.3 million BB̄ pairs. The mixing-induced CP violation is measured by reconstructing CP eigenstates (J/ψKS , ψ(2S)KS, χc1KS, ηcKS , J/ψKL, and J/ψK ∗0(KSπ0)) from the decay of one B meson while tagging the flavor of the accompanying B meson. From a study of the time-dependent assymetry we find sin 2φ1 = 0.99 ± 0.14 ± 0.06, where the first error is statistical and the second systematical.