Measurement of time-dependent CP asymmetries in B0→KS0ηγ decays
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Abstract
We report a measurement of time-dependent $CP$ violation parameters in ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}\ensuremath{\eta}\ensuremath{\gamma}$ decays. The study is based on a data sample, containing $772\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs, that was collected at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We obtain the $CP$ violation parameters of $\mathcal{S}=\ensuremath{-}1.32\ifmmode\pm\else\textpm\fi{}0.77(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.36(\mathrm{syst})$ and $\mathcal{A}=\ensuremath{-}0.48\ifmmode\pm\else\textpm\fi{}0.41(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.07(\mathrm{syst})$ for the invariant mass of the ${K}_{S}^{0}\ensuremath{\eta}$ system up to $2.1\text{ }\text{ }\mathrm{GeV}/{c}^{2}$.