Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System
The Belle Collaboration, K. Abe
Abstract
We present an improved measurement of the standard model CP violation parameter sin2phi1 (also known as sin2beta) based on a sample of 85 times 106 B Bbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in a J/psi KS, psi(2S) KS, chic1 KS, etac KS, J/psi K*0, or J/psi KL CP-eigenstate decay channel and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time interval between the two B meson decay points, we obtain sin2phi1 = 0.719 +/- 0.074(stat) +/- 0.035(syst).
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