Measurement of the Time-Dependent CP Asymmetry in the B0 --> Phi K0 Decay

Details Measurement of the Time-Dependent CP Asymmetry in the B0 --> Phi K0 Decay Measurement of the Time-Dependent CP Asymmetry in the B0 --> Phi K0 Decay

2004-03-16

arxiv.org/abs/hep-ex/0403026v1

Phys.Rev.Lett.93:071801,2004

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figures; submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.93.071801

We present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay B0 --> Phi K0. We use a sample of approximately 114 million B-meson pairs taken at the Upsilon(4S) resonance with the BaBar detector at the PEP-II B-meson Factory at SLAC. We reconstruct the CP eigenstates Phi K0_S and Phi K0_L where Phi --> K+ K-, K0_S --> pi+ pi-, and K0_L is observed via its hadronic interactions. The other B meson in the event is tagged as either a B0 or B0-bar from its decay products. The values of the CP-violation parameters are S = 0.47 +/- 0.34 (stat) +0.08/-0.06 (syst) and C = 0.01 +/- 0.33 (stat) +/- 0.10 (syst).

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