Inclusive study of bottomonium production in association with an $$\eta $$ η meson in $$e^+e^-$$ e + e - annihilations near $$\varUpsilon (5S)$$ Υ ( 5 S )
2018
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.
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