Search for $XYZ$ states in ${\rm Y}(1S)$ inclusive decays

Belle Collaboration, C. P. Shen, C. Z. Yuan +152

The branching fractions of the ${\rm Y}(1S)$ inclusive decays into final states with a $J/\psi$ or a $\psi (2S)$ are measured with improved precision to be $\BR(Υ(1S)\to J/ψ+ {\rm anything})=(5…