The branching fractions of the $\mathrm{\Upsilon }(1S)$ inclusive decays into final states with a $J/\mathrm{<ruby><rb>\psi </rb><rt>ぷさい</rt></ruby>}$ or a $\mathrm{<ruby><rb>\psi </rb><rt>ぷさい</rt></ruby>}(2S)$ are measured with improved precision to be $\mathcal{B}(\mathrm{\Upsilon }(1S)\to J/\mathrm{<ruby><rb>\psi </rb><rt>ぷさい</rt></ruby>}+\text{anything})=(5.25\pm 0.13(\mathrm{stat})\pm 0.25(\mathrm{syst}))\times {10}^{-4}$ and $\mathcal{B}(\mathrm{\Upsilon }(1S)\to \mathrm{<ruby><rb>\psi </rb><rt>ぷさい</rt></ruby>}(2S)+\text{anything})=(1.23\pm 0.17(\mathrm{stat})\pm 0.11(\mathrm{syst}))\times {10}^{-4}$. The first search for $\mathrm{\Upsilon }(1S)$ decays into $XYZ$ states that decay into a $J/\mathrm{<ruby><rb>\psi </rb><rt>ぷさい</rt></ruby>}$ or a $\mathrm{<ruby><rb>\psi </rb><rt>ぷさい</rt></ruby>}(2S)$ 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 $\mathrm{\Upsilon }(1S)$ inclusive decays are determined.

• Received 3 May 2016

DOI:https://doi.org/10.1103/PhysRevD.93.112013