Abstract
It is argued that the observed enhancement of the hadronic transition ϒ(4S) → ϒ(1S)η relative to ϒ(4S) → ϒ(1S)ππ can be explained if the resonance ϒ(4S) contains an admixture of a four-quark component, possibly due to the coupling to the meson channel [Formula: see text]. A test of the discussed mechanism by searching for the transition ϒ(4S) → ϒ(1S)η′(958) is suggested. Some properties of possible four-quark states related to the suggested one by the heavy quark spin symmetry are also discussed.
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