Measurement of the CP-Violating Asymmetry Amplitude sin2beta

Details Measurement of the CP-Violating Asymmetry Amplitude sin2beta Measurement of the CP-Violating Asymmetry Amplitude sin2beta

2002-07-17

arxiv.org/abs/hep-ex/0207042v2

Phys.Rev.Lett.89:201802,2002

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.89.201802

We present results on time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 million Y(4S) --> B Bbar decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B0 or B0bar from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta = 0.741 +/- 0.067 (stat) +/- 0.034 (syst) and |lambda| = 0.948 +/- 0.051 (stat) +/- 0.030 (syst). The magnitude of lambda is consistent with unity, in agreement with the Standard Model expectation of no direct CP violation in these modes.

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