Measurement of time-dependent CP violation parameters in B0→KS0KS0KS0 decays at Belle
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Abstract
We measure the time-dependent $CP$ violation parameters in ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{K}_{S}^{0}{K}_{S}^{0}$ decays using $772\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs collected at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. The obtained mixing-induced and direct $CP$ asymmetries are $\ensuremath{-}0.71\ifmmode\pm\else\textpm\fi{}0.23\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05\text{ }(\mathrm{syst})$ and $0.12\ifmmode\pm\else\textpm\fi{}0.16\text{ }(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.05\text{ }(\mathrm{syst})$, respectively. These values are consistent with the Standard Model predictions. The significance of $CP$ violation differs from zero by 2.5 standard deviations.