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Scattering amplitude and shift in self-energy in medium
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.Comment: 6 pages, revtex, with 1 eps figur
Vector and axial vector mesons at finite temperature
We consider the thermal correlation functions of vector and axial-vector
currents and evaluate corrections to the vector and axial-vector meson pole
terms to one loop in chiral perturbation theory. As expected, the pole
positions do not shift to leading order in temperature. But the residues
decrease with temperature
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