Study of the $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{D}_s^{+}{D}_s^{-}$ process from $\sqrt{s}$ = 4.42 to 4.95 GeV at BESIII

Abstract

Based on $8.5{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.42 and 4.95 GeV with the BESIII detector at the BEPCII storage ring, we investigate the process $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{D}_s^{+}{D}_s^{-}$. With no significant signal observed, upper limits on the Born cross sections of $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}{D}_s^{+}{D}_s^{-}$ at each energy value are determined at the 90% confidence level. Additionally, a search for intermediate charmonium-like resonances is performed in the $M(D_s^{+}{D}_s^{-})$ invariant-mass spectrum, but no significant resonant structures are observed with the current statistics.