Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System

Details Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System

2002-08-16

arxiv.org/abs/hep-ex/0208025v2

Phys.Rev.D66:071102,2002

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 3 figures, 3 tables, accepted for publication in PRD Rapid Communications

Scientific paper

10.1103/PhysRevD.66.071102

We present an improved measurement of the standard model CP violation parameter sin2phi_1 (also known as sin2beta) based on a sample of 85 times 10^6 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 K_S, psi(2S) K_S, chi_{c1} K_S, eta_c K_S, J/psi K^{*0}, or J/psi K_L 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 sin2phi_1 = 0.719 +/- 0.074(stat) +/- 0.035(syst).

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