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Scalar Glueball--Quarkonium Mixing and the Structure of the QCD Vacuum

J. Ellis·H. Fujii·D. Kharzeev
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Abstract

We use Ward identities of broken scale invariance to infer the amount of scalar glueball--$\bar{q}q$ 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 $γ\sim 36^{\circ}$, corresponding to near-maximal mixing of the glueball and $\bar{s}s$ components.

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J. Ellis, H. Fujii, D. Kharzeev. 1999-09-10. Scalar Glueball--Quarkonium Mixing and the Structure of the QCD Vacuum. https://arxiv.org/abs/hep-ph/9909322

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