Search for the $e^{+}{e}^{-}\to \ddot{I}•\ddot{I}{‡}_{c1}(3872)$ process at BESIII

Abstract

Based on 368.5 pb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies 4.914 and 4.946 GeV by the BESIII detector, the $e^{+}{e}^{-}\to \ddot{I}•\ddot{I}{‡}_{c1}(3872)$ process is searched for the first time. No significant signal is observed and the upper limits at the 90\% confidence level on the product of the Born cross section $\ddot{I}ƒ(e^{+}{e}^{-}\to \ddot{I}•\ddot{I}{‡}_{c1}(3872))$ and the branching fraction $\mathcal{B}[\ddot{I}{‡}_{c1}(3872)\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}J/\ddot{I}ˆ]$ at 4.914 and 4.946 GeV are set to be 0.85 and 0.96 pb, respectively. These measurements provide useful information for the production of the $\ddot{I}{‡}_{c1}(3872)$ at $e^{+}{e}^{-}$ collider and deepen our understanding about the nature of this particle.

11 pages, 3 figures