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Title: Medium modifications to the [omega]-meson mass in the Walecka model

Abstract

We calculate the effective mass of the [omega] meson in nuclear matter in a relativistic random-phase approximation to the Walecka model. The dressing of the meson propagator is driven by its coupling to particle-hole pairs and nucleon-antinucleon ([ital N[bar N]]) excitations. We report a reduction in the [omega]-meson mass of about 170 MeV at nuclear-matter saturation density. This reduction arises from a competition between the density-dependent (particle-hole) dressing of the propagator and vacuum polarization ([ital N[bar N]] pairs). While density-dependent effects lead to an increase in the mass proportional to the classical plasma frequency, vacuum polarization leads to an even larger reduction caused by the reduced effective nucleon mass in the medium.

Authors:
; ;  [1]
  1. (Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States) Supercomputer Computations Research Institute, Florida State University, Tallahassee, Florida 32306 (United States) Department of Physics and Mathematical Physics, University of Adelaide, South Australia 5005 (Australia))
Publication Date:
OSTI Identifier:
5093124
DOE Contract Number:  
FC05-85ER25000; FG05-92ER40750; FG05-86ER40273
Resource Type:
Journal Article
Journal Name:
Physical Review, C (Nuclear Physics); (United States)
Additional Journal Information:
Journal Volume: 49:4; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NUCLEAR MATTER; OMEGA PARTICLES; WALECKA MODEL; MASS; MESONS; NUCLEON-ANTINUCLEON INTERACTIONS; PARTICLE-HOLE MODEL; PROPAGATOR; RANDOM PHASE APPROXIMATION; VACUUM POLARIZATION; BARYON-BARYON INTERACTIONS; BARYONS; BOSONS; ELEMENTARY PARTICLES; FERMIONS; HADRON-HADRON INTERACTIONS; HADRONS; HYPERONS; INTERACTIONS; MATHEMATICAL MODELS; MATTER; NUCLEAR MODELS; OMEGA BARYONS; PARTICLE INTERACTIONS; STRANGE PARTICLES; 663110* - General & Average Properties of Nuclei & Nuclear Energy Levels- (1992-); 663120 - Nuclear Structure Models & Methods- (1992-); 663300 - Nuclear Reactions & Scattering, General- (1992-)

Citation Formats

Jean, H., Piekarewicz, J., and Williams, A.G. Medium modifications to the [omega]-meson mass in the Walecka model. United States: N. p., 1994. Web. doi:10.1103/PhysRevC.49.1981.
Jean, H., Piekarewicz, J., & Williams, A.G. Medium modifications to the [omega]-meson mass in the Walecka model. United States. doi:10.1103/PhysRevC.49.1981.
Jean, H., Piekarewicz, J., and Williams, A.G. Fri . "Medium modifications to the [omega]-meson mass in the Walecka model". United States. doi:10.1103/PhysRevC.49.1981.
@article{osti_5093124,
title = {Medium modifications to the [omega]-meson mass in the Walecka model},
author = {Jean, H. and Piekarewicz, J. and Williams, A.G.},
abstractNote = {We calculate the effective mass of the [omega] meson in nuclear matter in a relativistic random-phase approximation to the Walecka model. The dressing of the meson propagator is driven by its coupling to particle-hole pairs and nucleon-antinucleon ([ital N[bar N]]) excitations. We report a reduction in the [omega]-meson mass of about 170 MeV at nuclear-matter saturation density. This reduction arises from a competition between the density-dependent (particle-hole) dressing of the propagator and vacuum polarization ([ital N[bar N]] pairs). While density-dependent effects lead to an increase in the mass proportional to the classical plasma frequency, vacuum polarization leads to an even larger reduction caused by the reduced effective nucleon mass in the medium.},
doi = {10.1103/PhysRevC.49.1981},
journal = {Physical Review, C (Nuclear Physics); (United States)},
issn = {0556-2813},
number = ,
volume = 49:4,
place = {United States},
year = {1994},
month = {4}
}