Inclusive study of bottomonium production in association with an $\eta $ meson in $e^+e^-$ annihilations near $\varUpsilon (5S)$

2018
We study bottomonium production in association with an \(\ eta\) mesonin \(e^+e^-\) annihilations near the \(\varUpsilon (5S)\), at a centre-of-mass energy of \(\sqrt{s}=10.866\) GeV. The results are based on the 121.4 fb\(^{-1}\) data sample collected by the Belle experimentat the asymmetric-energy KEKBcollider. Only the \(\ eta\) mesonis reconstructed and the missing- mass spectrumof \(\eta \) candidates is investigated. We observe the \(e^+e^-\rightarrow \eta \varUpsilon _J(1D)\) process and find evidence for the \(e^+e^-\rightarrow \eta \varUpsilon (2S)\) process, while no significant signals of \(\varUpsilon (1S)\), \(h_b(1P)\), nor \(h_b(2P)\) are found. Cross sections for the studied processes are reported.
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