1998/01/31 by L. A. Kondratyuk, L.A. Kondratyuk, A. Sibirtsev +3 · 2 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1103/physrevc.58.1078
published as Phys.Rev.C58:1078-1085,1998 · 20 pages, LaTeX, including 7 ps-figures, UGI-97-4, revised version, to be pub. in Phys. Rev. C
arxiv created 1998/06/06 · openalex publication_date 1998/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We calculate the momentum dependence of the \ensuremathρ-meson self-energy based on the dispersion relation for the \ensuremathρN scattering amplitude f(\ensuremathω) at low nuclear density. The imaginary part of f(\ensuremathω) is determined from the optical theorem, while the total \ensuremathρN cross section is obtained within the vector dominance model at high energy and within the resonance model at low energy. Our numerical results indicate a sizable broadening of the \ensuremathρ-meson width in the medium especially for low relative momenta p while the real part of the \ensuremathρ self-energy is found to change its sign and to become repulsive already at momenta above 100 MeV/c. Extrapolating to nuclear saturation density \ensuremathρ0 we find a dropping of the \ensuremathρ mass for p\ensuremath≈ 0 roughly in line with the QCD sum rule analysis of Hatsuda while at high energy an increase of the \ensuremathρ mass close to the prediction by Eletsky and Ioffe is obtained. However, when including a broadening of the baryonic resonances in the medium, the \ensuremathρ-meson mass shift at p\ensuremath≈0 becomes slightly repulsive, whereas the width increases substantially.