Measurements of the observed cross sections for $e^{+}{e}^{-}\to$ exclusive light hadrons containing $\ddot{I}{€}^0\ddot{I}{€}^0$ at $\sqrt{s}=3.773$, 3.650 and 3.6648 GeV

Abstract

By analyzing the data sets of 17.3, 6.5 and 1.0 pb${}^{-1}$ taken, respectively, at $\sqrt{s}=3.773$, 3.650 and 3.6648 GeV with the BES-II detector at the BEPC collider, we measure the observed cross sections for $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$, $K^{+}{K}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$, $2(\ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0)$, $K^{+}{K}^{-}\ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0\ddot{I}{€}^0$ and $3(\ddot{I}{€}^{+}\ddot{I}{€}^{-})\ddot{I}{€}^0\ddot{I}{€}^0$ at the three energy points. Based on these cross sections we set the upper limits on the observed cross sections and the branching fractions for $\ddot{I}ˆ(3770)$ decay into these final states at 90% C.L..

7 pages, 2 figures