Measurement of CP-violating asymmetries in B0 decays to CP eigenstates

Details Measurement of CP-violating asymmetries in B0 decays to CP eigenstates Measurement of CP-violating asymmetries in B0 decays to CP eigenstates

2001-02-12

arxiv.org/abs/hep-ex/0102030v2

Phys.Rev.Lett.86:2515-2522,2001

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 2 postscript figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.86.2515

We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23 million Upsilon(4S)-->B-anti-B decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events where one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined 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. The result is sin2beta=0.34 +/- 0.20 (stat) +/- 0.05 (syst).

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