Partial-wave analysis of $J/\ddot{I}ˆ\to K^{+}{K}^{-}\ddot{I}{€}^0$

Abstract

A partial-wave analysis of the decay $J/\ddot{I}ˆ\to K^{+}{K}^{-}\ddot{I}{€}^0$ has been made using $(223.7\pm 1.4)\times 10^6$ $J/\ddot{I}ˆ$ events collected with the BESIII detector in 2009. The analysis, which is performed within the isobar-model approach, reveals contributions from $K_2^{\ast }(1430{)}^{\pm }$, $K_2^{\ast }(1980{)}^{\pm }$ and $K_4^{\ast }(2045{)}^{\pm }$ decaying to $K^{\pm }\ddot{I}{€}^0$. The two latter states are observed in $J/\ddot{I}ˆ$ decays for the first time. Two resonance signals decaying to $K^{+}{K}^{-}$ are also observed. These contributions can not be reliably identified and their possible interpretations are discussed. The measured branching fraction $B(J/\ddot{I}ˆ\to K^{+}{K}^{-}\ddot{I}{€}^0)$ of $(2.88\pm 0.01\pm 0.12)\times 10^{-3}$ is more precise than previous results. Branching fractions for the reported contributions are presented as well. The results of the partial-wave analysis differ significantly from those previously obtained by BESII and BABAR.

14 pages, 4 figures