Masses, decays and mixings of gluonia in QCD

Abstract

This is a review of the estimate of the gluonia masses, decay and mixings from QCD spectral sum rules and low-energy theorems. Some phenomenological maximal gluonium-quarkonium mixing shemes in the scalar sector are presented. This talk is a compact version of the work in Ref.[1] (hep-ph/9612457) having the same title.

Talk given at the QCD 97 Euroconference, Montpellier 3-9th July (1997)

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• New QCD estimate of the kaon penguin matrix elements and epsilon'/epsilon
• Gluonium nature of the sigma/f_0(600) from its coupling to KK
• sigma and f_0(980) substructures from gamma-gamma to pi-pi, J/psi, phi radiative and D_s semi-leptonic decays
• The sigma and f_0(980) from Ke4 + pi-pi scatterings data
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• SVZ + 1/q2 expansion versus some QCD holographic Models
• Pseudoscalar Glueball Mass: QCD vs. Lattice Gauge Theory Prediction
• New Glueball-Meson Mass Relations
• XYZ-SU3 Breakings from Laplace Sum Rules at Higher Orders
• Spectra of glueballs and oddballs and the equation of state from holographic QCD
• Di-Gluonium Sum Rules, I = 0 Scalar Mesons and Conformal Anomaly
• Improved XTZ masses and mass ratios from Laplace Sum Rules at NLO
• Holographic cold dense matter constrained by neutron stars
• Scalar mesons and low-mass sigma: Does the $\sigma$ reveal the confinement singularity?
• V-A hadronic tau decays : a QCD laboratory
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• Insights into $Q^2{\bar{Q}}^2$ states from an effective perspective