2001/07/02 by L. Mornas, Mornas, L.
Physics and Astronomy · #High-Energy Particle Collisions Research #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/0107005
35 pages, 10 figures, subm. to J. Phys. G
arxiv created 2001/07/02 · arxiv updated 2009/12/01
We calculate dispersion relations and propagators for the σ, ω, π, ρ, δ, η and a1 mesons in relativistic, dense, hot, symmetric nuclear matter. In addition to the usual mixing of the σ-ω system, we obtain mixing of the δ with the longitudinal ρ mode and of the tranverse ρ with the transverse a1 mode. Finally, the component of the a1 polarization along the transferred momentum modifies the in-medium pion propagator in a way similar to the Migdal contact interaction, but with the opposite sign. The spurious pion condensate as well as the additional contribution from the a1 meson are removed by a contact term. We compare two ways of implementing contact term subtraction.