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Spectral Representation and Operator-Product Expansions
Phys. Rev. D 8, 4644 – Published 15 December, 1973
DOI: https://doi.org/10.1103/PhysRevD.8.4644
Abstract
We discuss the question of generating the singularity structure of the vacuum expectation value of the commutator of two electromagnetic currents as given by operator-product expansions, from the Källén-Lehmann representation. It is shown that this is possible provided the formally divergent integrals involving the spectral function are interpreted suitably. An example is discussed in detail.
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