Systematic study of the experimental measurements on ratios of different $\hat{I}\yen$ states

Abstract

The world data on yields and ratios of different $\hat{I}\yen$ states created in hadron collisions at $\sqrt{s}=19-8000$ GeV are examined in systematic way. We find that $\hat{I}\yen (2S)/\hat{I}\yen (1S)=0.275\pm 0.005$ and $\hat{I}\yen (3S)/\hat{I}\yen (1S)=0.128\pm 0.004$. No signficant energy dependence of these ratios are observed within the broad collision energies. In addition, the rapidity, transverse momentum, and transverse mass dependence of these ratios are also reported.