Retarded/Advanced Correlation Functions and Soft Photon Production in the Hard Loop Approximation

Details Retarded/Advanced Correlation Functions and Soft Photon Production in the Hard Loop Approximation Retarded/Advanced Correlation Functions and Soft Photon Production in the Hard Loop Approximation

1994-03-21

arxiv.org/abs/hep-ph/9403320v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 figures available (PETITG@LAPVAX.IN2P3.FR), ENSLAPP-A-452/93, NSF-ITP-93-155

Scientific paper

We apply the retarded/advanced formalism of real time field theory to the QED
or QED like case. We obtain a general expression for the imaginary part of the
two-point correlation function in terms of discontinuities. The hard loop
expansion is derived. The formalism is used to extract the divergent part of
the soft fermion loop contribution to the real soft photon production.

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