We measure the time-dependent CP asymmetry parameters in B-0 -> K+ K- K-0 based on a data sample of approximately 227 x 10(6) B-meson pairs recorded at the Upsilon(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. We reconstruct two-body B-0 decays to phi(1020)K-S(0) and phi(1020)K-L(0), and the three-body decay K+ K- K-S(0) with phi(1020)K-S(0) excluded. For the B-0 -> phi K-0 decays, we measure sin2 beta(eff)(phi K-0) = +0.50 +/- 0.25(stat)(-0.04)(+0.07)(syst). The B-0 -> K+ K- K-S(0) decays are dominated by K+ K- S wave, as determined from an angular analysis; we measure sin2 beta(eff)((K+K-KS0)) = +0.55 +/- 0.22(stat) +/- 0.04(syst) +/- 0.11(CP), where the last error is due to the uncertainty in the fraction of CP-even contributions to the decay amplitude. We find no evidence for direct CP violation.

Measurement of CP asymmetries in B-0 ->phi K-0 and B-0 -> K+ K- K-s(0) decays

FERRONI, Fernando
2005

Abstract

We measure the time-dependent CP asymmetry parameters in B-0 -> K+ K- K-0 based on a data sample of approximately 227 x 10(6) B-meson pairs recorded at the Upsilon(4S) resonance with the BABAR detector at the PEP-II B-meson Factory at SLAC. We reconstruct two-body B-0 decays to phi(1020)K-S(0) and phi(1020)K-L(0), and the three-body decay K+ K- K-S(0) with phi(1020)K-S(0) excluded. For the B-0 -> phi K-0 decays, we measure sin2 beta(eff)(phi K-0) = +0.50 +/- 0.25(stat)(-0.04)(+0.07)(syst). The B-0 -> K+ K- K-S(0) decays are dominated by K+ K- S wave, as determined from an angular analysis; we measure sin2 beta(eff)((K+K-KS0)) = +0.55 +/- 0.22(stat) +/- 0.04(syst) +/- 0.11(CP), where the last error is due to the uncertainty in the fraction of CP-even contributions to the decay amplitude. We find no evidence for direct CP violation.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12571/2176
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