Search forD0→γγand improved measurement of the branching fraction forD0→π0π0
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Abstract
Using $2.92\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of electron-positron annihilation data collected at $\sqrt{s}=3.773\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector, we report the results of a search for the flavor-changing neutral current process ${D}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}$ using a double-tag technique. We find no signal and set an upper limit at 90% confidence level for the branching fraction of $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma})<3.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$. We also investigate ${D}^{0}$-meson decay into two neutral pions, obtaining a branching fraction of $\mathcal{B}({D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0})=(8.24\ifmmode\pm\else\textpm\fi{}0.21(\text{stat})\ifmmode\pm\else\textpm\fi{}0.30(\text{syst}))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, the most precise measurement to date and consistent with the current world average.
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