Search for $XYZ$ states in $\hat{I}\yen (1S)$ inclusive decays

Abstract

The branching fractions of the $\hat{I}\yen (1S)$ inclusive decays into final states with a $J/\ddot{I}ˆ$ or a $\ddot{I}ˆ(2S)$ are measured with improved precision to be $\BR(Î¥(1S)\to J/ψ+ {\rm anything})=(5.25\pm 0.13(\mathrm{stat.})\pm 0.25(\mathrm{syst.}))\times 10^{-4}$ and $\BR(Î¥(1S)\to ψ(2S) + {\rm anything})=(1.23\pm 0.17(\mathrm{stat.})\pm 0.11(\mathrm{syst.}))\times 10^{-4}$. The first search for $\hat{I}\yen (1S)$ decays into $XYZ$ states that decay into a $J/\ddot{I}ˆ$ or a $\ddot{I}ˆ(2S)$ plus one or two charged tracks yields no significant signals for $XYZ$ states in any of the examined decay modes, and upper limits on their production rates in $\hat{I}\yen (1S)$ inclusive decays are determined.

10 pages, 7 figures, 3 tables