Time-dependent amplitude analysis of B0KS0π+π

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 80, 112001 – Published 2 December 2009

Abstract

We perform a time-dependent amplitude analysis of B0KS0π+π decays to extract the CP violation parameters of f0(980)KS0 and ρ0(770)KS0 and the direct CP asymmetry of K*+(892)π. The results are obtained from a data sample of (383±3)×106 BB¯ decays, collected with the BABAR detector at the PEP-II asymmetric–energy B factory at SLAC. We find two solutions, with an equivalent goodness-of-fit. Including systematic and Dalitz plot model uncertainties, the combined confidence interval for values of the CP parameter βeff in B0 decays to f0(980)KS0 is 18°<βeff<76° at 95% confidence level (C.L). CP conservation in B0 decays to f0(980)KS0 is excluded at 3.5 standard deviations including systematic uncertainties. For B0 decays to ρ0(770)KS0, the combined confidence interval is 9°<βeff<57° at 95% C.L. In decays to K*+(892)π we measure the direct CP asymmetry to be ACP=0.20±0.10±0.01±0.02. The measured phase difference (including B0B¯0 mixing) between decay amplitudes of B0K*+(892)π and B¯0K*(892)π+, excludes the interval 137°<ΔΦ(K*+(892)π)<5° at 95% C.L.

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  • Received 25 May 2009

DOI:https://doi.org/10.1103/PhysRevD.80.112001

©2009 American Physical Society

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Vol. 80, Iss. 11 — 1 December 2009

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