Systematic study of the experimental measurements on ratios of different ${\rm Y}$ states

Wangmei Zha, Chi Yang, Bingchu Huang +4

The world data on yields and ratios of different ${\rm Y}$ states created in hadron collisions at $\sqrt{s}=19-8000$ GeV are examined in systematic way. We find that $Υ(2S)/Υ(1S)=0.275…