Measurement of time-dependentCPasymmetry inB0→KS0π0γdecays

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Abstract

We measure the time-dependent $CP$ asymmetry in ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ decays for two regions of ${K}_{S}^{0}\mathrm{\text{\ensuremath{-}}}{\ensuremath{\pi}}^{0}$ invariant mass, $m({K}_{S}^{0}{\ensuremath{\pi}}^{0})$, using the final BABAR data set of $467\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the PEP-II ${e}^{+}{e}^{\ensuremath{-}}$ collider at SLAC. We find $339\ifmmode\pm\else\textpm\fi{}24$ ${B}^{0}\ensuremath{\rightarrow}{K}^{*0}\ensuremath{\gamma}$ candidates and measure ${S}_{{K}^{*}\ensuremath{\gamma}}=\ensuremath{-}0.03\ifmmode\pm\else\textpm\fi{}0.29\ifmmode\pm\else\textpm\fi{}0.03$ and ${C}_{{K}^{*}\ensuremath{\gamma}}=\ensuremath{-}0.14\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.03$. In the range $1.1<m({K}_{S}^{0}{\ensuremath{\pi}}^{0})<1.8\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ we find $133\ifmmode\pm\else\textpm\fi{}20$ ${B}^{0}\ensuremath{\rightarrow}{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ candidates and measure ${S}_{{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}}=\ensuremath{-}0.78\ifmmode\pm\else\textpm\fi{}0.59\ifmmode\pm\else\textpm\fi{}0.09$ and ${C}_{{K}_{S}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}}=\ensuremath{-}0.36\ifmmode\pm\else\textpm\fi{}0.33\ifmmode\pm\else\textpm\fi{}0.04$. The uncertainties are statistical and systematic, respectively.

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