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

Abstract

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 $\BR(Υ(1S)\to J/ψ+ {\rm anything})=(5.25\pm 0.13(\mathrm{stat.})\pm 0.25(\mathrm{syst.}))\times 10^{-4}$ and $\BR(Υ(1S)\to ψ(2S) + {\rm anything})=(1.23\pm 0.17(\mathrm{stat.})\pm 0.11(\mathrm{syst.}))\times 10^{-4}$. The first search for ${\rm Y}(1S)$ decays into $XYZ$ states that decay into a $J/\psi$ or a $\psi (2S)$ 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 ${\rm Y}(1S)$ inclusive decays are determined.

arXiv comment10 pages, 7 figures, 3 tables

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• The $XYZ$ states: experimental and theoretical status and perspectives
• Breakdown of NRQCD Factorization in Processes Involving Two Quarkonia and its Cure
• Experimental review of the ${\rm Y}(1S,2S,3S)$ physics at $e^{+}{e}^{-}$ colliders and the LHC
• Inclusive $J/\psi$ and ${\eta }_c$ production in ${\rm Y}$ decay at $\mathcal{O}({\alpha }_s^5)$ in nonrelativistic QCD factorization