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Scattering amplitude and shift in self-energy in medium

S. Mallik

hep-tharXiv:hep-th/0108139

Abstract

Two simple proofs are presented for the first order virial expansion of the self-energy of a particle moving through a medium, characterised by temperature and/or chemical potential(s). One is based on the virial expansion of the self-energy operator itself, while the other is on the analysis of its Feynman diagrams in configuration space.

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