The scalar gluonic trace form factor G_N(t) is expressed as G_{s,g}(t) + G_{s,q}(t) - σ(t)/M, linking the QCD trace anomaly to DVCS and J/ψ observables.
Mass sum rule of hadrons in the QCD instanton vacuum
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abstract
We briefly review the key aspect of the QCD instanton vacuum in relation to the quantum breaking of conformal symmetry and the trace anomaly. We use Ji$^\prime s$ invariant mass decomposition of the energy momentum tensor together with the trace anomaly, to discuss the mass budget of the nucleon and pion in the QCD instanton vacuum. A measure of the gluon condensate in the nucleon, is a measure of the compressibility of the QCD instanton vacuum as a dilute topological liquid.
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Experimental access to the gluonic origin of the proton mass
The scalar gluonic trace form factor G_N(t) is expressed as G_{s,g}(t) + G_{s,q}(t) - σ(t)/M, linking the QCD trace anomaly to DVCS and J/ψ observables.