Abstract
In a conformal invariant quantum field theory (in 4 space time dimensions) Wilson operator product expansions converge on the vacuum, because they are closely related to conformal partial wave expansions.
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Mack, G. Convergence of operator product expansions on the vacuum in conformal invariant quantum field theory. Commun.Math. Phys. 53, 155–184 (1977). https://doi.org/10.1007/BF01609130
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DOI: https://doi.org/10.1007/BF01609130