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We present a precise measurement of the CP violation parameter sin2phi_1 andthe direct CP violation parameter A_f using the final data sample of 772x10^6B\bar B pairs collected at the Upsilon(4S) resonance with the Belle detector atthe KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructedin a J/psi K0S, psi(2S) K0S, chi_c1 K0S or J/psi K0L CP-eigenstate and itsflavor is identified from the decay products of the accompanying B meson. Fromthe distribution of proper time intervals between the two B decays, we obtainthe following CP violation parameters:sin2phi_1=0.667+-0.023(stat)+-0.012(syst) andA_f=0.006+-0.016(stat)+-0.012(syst).

Precise measurement of the CP violation parameter sin2phi_1 in B0-->(c\bar c)K0 decays