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

Journal Article · Fri Apr 01 00:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.1981· OSTI ID:5093124

Jean, H; Piekarewicz, J; Williams, A G ^[1]

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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)

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.

• DOE Contract Number: FC05-85ER25000; FG05-92ER40750; FG05-86ER40273
• OSTI ID: 5093124
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Vol. 49:4; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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-)