Study of $e^{+}{e}^{-}\to D^{+}{D}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ at center-of-mass energies from 4.36 to 4.60 GeV

Abstract

We report a study of the $e^{+}{e}^{-}\to D^{+}{D}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ process using $e^{+}{e}^{-}$ collision data samples with an integrated luminosity of $2.5{\mathrm{fb}}^{-1}$ at center-of-mass energies from 4.36 to $4.60\mathrm{GeV}$, collected with the BESIII detector at the BEPCII storage ring. The $D_1(2420{)}^{+}$ is observed in the $D^{+}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ mass spectrum. The mass and width of the $D_1(2420{)}^{+}$ are measured to be $(2427.2\pm 1.0_{stat.}\pm 1.2_{syst.})\mathrm{MeV}/{\mathrm{c}}^2$ and $(23.2\pm 2.3_{stat.}\pm 2.3_{syst.})\mathrm{MeV}$, respectively. The first errors are statistical and the second ones are systematic. In addition, the Born cross sections of the $e^{+}{e}^{-}\to D_1(2420{)}^{+}{D}^{-}+c.c.\to D^{+}{D}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ and $e^{+}{e}^{-}\to \ddot{I}ˆ(3770)\ddot{I}{€}^{+}\ddot{I}{€}^{-}\to D^{+}{D}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{-}$ processes are measured as a function of the center-of-mass energy.

Updated version published in PLB