Measurement of time dependent CP asymmetry parameters in B0 meson decays to ωKS0 , η′K0 , and π0KS0

Résumé fourni par la source

We present measurements of the time-dependent $CP$-violation parameters $S$ and $C$ in the decays ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\omega}{K}_{S}^{0}$, ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0}$, reconstructed as ${\ensuremath{\eta}}^{\ensuremath{'}}{K}_{S}^{0}$ and ${\ensuremath{\eta}}^{\ensuremath{'}}{K}_{L}^{0}$, and ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{K}_{S}^{0}$. The data sample corresponds to the full BABAR dataset of $467\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs produced at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider at the Stanford Linear Accelerator Center. The results are ${S}_{\ensuremath{\omega}{K}_{S}^{0}}={0.55}_{\ensuremath{-}0.29}^{+0.26}\ifmmode\pm\else\textpm\fi{}0.02$, ${C}_{\ensuremath{\omega}{K}_{S}^{0}}=\ensuremath{-}{0.52}_{\ensuremath{-}0.20}^{+0.22}\ifmmode\pm\else\textpm\fi{}0.03$, ${S}_{{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0}}=0.57\ifmmode\pm\else\textpm\fi{}0.08\ifmmode\pm\else\textpm\fi{}0.02$, ${C}_{{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0}}=\ensuremath{-}0.08\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.02$, ${S}_{{\ensuremath{\pi}}^{0}{K}_{S}^{0}}=0.55\ifmmode\pm\else\textpm\fi{}0.20\ifmmode\pm\else\textpm\fi{}0.03$, and ${C}_{{\ensuremath{\pi}}^{0}{K}_{S}^{0}}=0.13\ifmmode\pm\else\textpm\fi{}0.13\ifmmode\pm\else\textpm\fi{}0.03$, where the first errors are statistical and the second systematic. These results are consistent with our previous measurements and the world average of $\mathrm{sin}2\ensuremath{\beta}$ measured in ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}_{S}^{0}$.

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