Scalar Glueball--Quarkonium Mixing and the Structure of the QCD Vacuum
Abstract
We use Ward identities of broken scale invariance to infer the amount of scalar glueball--qq meson mixing from the ratio of quark and gluon condensates in the QCD vacuum. Assuming dominance by a single scalar state, as suggested by a phase-shift analysis, we find a mixing angle γ 36, corresponding to near-maximal mixing of the glueball and ss components.
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