Measurement of time-dependent CP violation in B0→KS0π0π0 decays

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Abstract

We report a measurement of time-dependent $CP$ violation in ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays using a data sample of $772\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }B\overline{B}$ pairs collected by the Belle experiment running at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider. This decay proceeds mainly via a $b\ensuremath{\rightarrow}sd\overline{d}$ ``penguin'' amplitude. The results are $\mathrm{sin}2{\ensuremath{\phi}}_{1}^{\text{eff}}=0.9{2}_{\ensuremath{-}0.31}^{+0.27}$ (stat.) $\ifmmode\pm\else\textpm\fi{}0.11$ (syst.) and $\mathcal{A}=0.28\ifmmode\pm\else\textpm\fi{}0.21$ (stat.) $\ifmmode\pm\else\textpm\fi{}0.04$ (syst.), which are the most precise measurements of $CP$ violation in this decay mode to date. The value for the $CP$-violating parameter $\mathrm{sin}2{\ensuremath{\phi}}_{1}^{\text{eff}}$ is consistent with that obtained using decay modes proceeding via a $b\ensuremath{\rightarrow}c\overline{c}s$ ``tree'' amplitude.

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