Energy scan of the $e^{+}{e}^{-}\to h_b(nP){\pi }^{+}{\pi }^{-}$ $(n=1,2)$ cross sections and evidence for ${\rm Y}(11020)$ decays into charged bottomonium-like states

Abstract

Using data collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we measure the energy dependence of the $e^{+}{e}^{-}\to h_b(nP){\pi }^{+}{\pi }^{-}$ $(n=1,2)$ cross sections from thresholds up to $11.02$GeV. We find clear ${\rm Y}(10860)$ and ${\rm Y}(11020)$ peaks with little or no continuum contribution. We study the resonant substructure of the ${\rm Y}(11020)\to h_b(nP){\pi }^{+}{\pi }^{-}$ transitions and find evidence that they proceed entirely via the intermediate isovector states $Z_b(10610)$ and $Z_b(10650)$. The relative fraction of these states is loosely constrained by the current data: the hypothesis that only $Z_b(10610)$ is produced is excluded at the level of 3.3 standard deviations, while the hypothesis that only $Z_b(10650)$ is produced is not excluded at a significant level.

8 pages, 4 figures, submitted to Physical Review Letters

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• Big-Bang Nucleosynthesis
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• Hadro-Charmonium
• Amplitude analysis of e+e- => Y(nS)pi+pi- at sqrt(s)=10.865 GeV
• Measurement of the $e^{+}{e}^{-}\to \eta J/\psi$ cross section and search for $e^{+}{e}^{-}\to {\pi }^{0}J/\psi$ at center-of-mass energies between 3.810 and 4.600~GeV

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