The paper reviews and speculates that gluonic degrees of freedom, beyond giving the eta' its mass, may explain a narrow eta'-nucleon resonance and parity doublets through Gribov's supercritical confinement.
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Gluons in the $\eta'$ and in nucleon resonances
The paper reviews and speculates that gluonic degrees of freedom, beyond giving the eta' its mass, may explain a narrow eta'-nucleon resonance and parity doublets through Gribov's supercritical confinement.