Measurement ofB(ψ(3770)→γχc1)and search forψ(3770)→γχc2

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Abstract

We report a measurement of the branching fraction for $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1}$ and search for the transition $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c2}$ based on $2.92\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of ${e}^{+}{e}^{\ensuremath{-}}$ data accumulated at $\sqrt{s}=3.773\text{ }\text{ }\mathrm{GeV}$ with the BESIII detector at the BEPCII collider. We measure $\mathcal{B}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1})=(2.48\ifmmode\pm\else\textpm\fi{}0.15\ifmmode\pm\else\textpm\fi{}0.23)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}$, which is the most precise measurement to date. The upper limit on the branching fraction of $\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c2}$ at a 90% confidence level is $\mathcal{B}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c2})<0.64\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}3}$. The corresponding partial widths are $\mathrm{\ensuremath{\Gamma}}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c1})=(67.5\ifmmode\pm\else\textpm\fi{}4.1\ifmmode\pm\else\textpm\fi{}6.7)\text{ }\mathrm{keV}$ and $\mathrm{\ensuremath{\Gamma}}(\ensuremath{\psi}(3770)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\chi}}_{c2})<17.4\text{ }\mathrm{keV}$.

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