The causal Meyer‐Suura structure functions are projected into irreducible representations of the Lorentz group. A clarification of the connection between light‐cone singularities and Lorentz poles is obtained: We find that in general a light‐cone singularity of the type 1/(− x2 + iεx0)α, in the operator product of the hadronic electromagnetic current, is built up from a sequence of Lorentz poles at λn = 1 + α − n whose residues are polynomials of order n in the virtual photon square mass.
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© 1972 The American Institute of Physics.
1972
The American Institute of Physics
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