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We present a measurement of the standard model CP violation parameter sin2φ₁ based on a 29.1fb^-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 sin2φ₁0ex0ex=0ex0ex0.99±0.14(stat)±0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.
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Abe et al. (2001) studied this question.
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