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The construction of BRST invariant local operators with the quantum numbersof the lightest glueball states, $J^{PC}= 0^{++}, 2^{++}, 0^{-+}$, is workedout by making use of an Euclidean confining renormalizable gauge theory. Thecorrelation functions of these operators are evaluated by employing a confininggluon propagator of the Gribov type and shown to display a spectralrepresentation with positive spectral densities. An attempt to provide a firstqualitative analysis of the ratios of the masses of the lightest glueballs isalso discussed

Constructing local composite operators for glueball states from a confining Gribov propagator