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Gluonia in QCD with massless quarks

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INSPIRE-HEP
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Abstract

I briefly review the estimate of the gluonia masses, decay and mixings in QCD with massless quarks from QCD spectral sum rules and some low-energy theorems. The data in the $0^{++}$ channel can be explained with some maximal gluonium-quarkonium mixing schemes, which then suggest a large violation of the OZI rule, similar to the case of the $\eta'$ in the $U(1)_A$ sector.

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