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We study bottomonium production in association with an $\eta $ meson in $e^+e^-$ 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 experiment at the asymmetric-energy KEKB collider. Only the $\eta $ meson is reconstructed and the missing-mass spectrum of $\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.

european physical journal. c, particles and fields

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