Improved Measurement of CP Asymmetry in the Neutral B Meson System

Details Improved Measurement of CP Asymmetry in the Neutral B Meson System Improved Measurement of CP Asymmetry in the Neutral B Meson System

2002-05-10

arxiv.org/abs/hep-ex/0205020v2

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 3 figures, 2 tables. For the proceedings of the XXXVIIth Rencontres de Moriond on QCD and Hadronic Interactions

Scientific paper

We present an improved measurement of the standard model CP violation parameter sin2phi1 (also known as sin2beta) based on a sample of 45x10^6 BBbar 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 the J/psiKS, Psi(2S)KS, chi_c1KS, eta_cKS, J/psiK^*0, or J/psiKL CP-eigenstate decay channel and the flavor of 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 obtain sin2phi1 = 0.82 +/- 0.12(stat) +/- 0.05(syst). The result is preliminary.

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