On the ${\eta }^{\prime }$ Gluonic Admixture

Abstract

The ${\eta }^{\prime }$ which is an $SU(3{)}_F$ singlet state can contain a pure gluon component, gluonium. We examine this possibility by analysing all available experimental data. It is pointed out that the ${\eta }^{\prime }$ gluonic component may be as large as 26%. We also show that the amplitude for $J/\psi ->{\eta }^{\prime }\gamma$ decay obtains a notable contribution from gluonium.

13 pages LaTeX, 5 eps figures

References in corpus (1)

• New measurement of the rare decay $\varphi \to {\eta }^{\prime }\gamma$ with CMD-2

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