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Time-dependent amplitude analysis ofB0→KS0π+π−

Journal article published in 2009 by B. Aubert, Y. Karyotakis, J. P. Lees, V. Poireau, E. Prencipe, X. Prudent, V. Tisserand, J. Garra Tico, E. Grauges, M. Martinelli, A. Palano, M. Pappagallo, G. Eigen, B. Stugu, L. Sun and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We perform a time-dependent amplitude analysis of $B^0 \to K^0_Sπ^+π^-$ decays to extract the CP violation parameters of $f_0(980) K^0_S$ and $ρ^0(770) K^0_S$ and the direct CP asymmetry of $K^{*+}(892) π^-$. The results are obtained from a data sample of $(383 ± 3) \times 10^6$ $B\bar{B}$ 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 $β_{eff}$ in $B^0$ decays to $f_0(980) K^0_S$ is $18^o < β_{eff} < 76^o$ at 95% confidence level (C.L). CP conservation in $B^0$ decays to $f_0(980) K^0_S$ is excluded at $3.5σ$ including systematic uncertainties. For $B^0$ decays to $ρ^0(770) K^0_S$, the combined confidence interval is $-9^o < β_{eff} < 57^o$ at 95% C.L. In decays to $K^{*+}(892) π^-$ we measure the direct CP asymmetry to be $A_{CP}=-0.20 ± 0.10 ± 0.01 ± 0.02$. The measured phase difference (including $B^0\bar{B}^0$ mixing) between decay amplitudes of $B^0 \to K^{*+}(892) π^-$ and $\bar{B}^0 \to K^{*-}(892) π^+$, excludes the interval $-137^o < ΔΦ(K^{*+}(892) π^-) < -5^o$ at 95% C.L. Comment: 30 pages, 42 postscript figures, submitted to Phys. Rev. D