A BRST-exact quartet extended to SU(3) Yang-Mills generates i-particle propagators as off-shell BRST cocycles whose composite two-point function admits a Källén-Lehmann representation with positive real threshold.
Constructing local composite operators for glueball states from a confining Gribov propagator
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abstract
The construction of BRST invariant local operators with the quantum numbers of the lightest glueball states, $J^{PC}= 0^{++}, 2^{++}, 0^{-+}$, is worked out by making use of an Euclidean confining renormalizable gauge theory. The correlation functions of these operators are evaluated by employing a confining gluon propagator of the Gribov type and shown to display a spectral representation with positive spectral densities. An attempt to provide a first qualitative analysis of the ratios of the masses of the lightest glueballs is also discussed
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Background-Equivariant BRST Observables and i-Particle Propagators from an Auxiliary Quartet in SU(3) Yang-Mills
A BRST-exact quartet extended to SU(3) Yang-Mills generates i-particle propagators as off-shell BRST cocycles whose composite two-point function admits a Källén-Lehmann representation with positive real threshold.