Medium modifications to the ωmeson mass in the Walecka model
Abstract
We calculate the effective mass of the ω meson in nuclear matter in a relativistic randomphase approximation to the Walecka model. The dressing of the meson propagator is driven by its coupling to particlehole pairs and nucleonantinucleon (NN̄) excitations. We report a reduction in the ωmeson mass of about 170 MeV at nuclearmatter saturation density. This reduction arises from a competition between the densitydependent (particlehole) dressing of the propagator and vacuum polarization (NN̄ pairs). While densitydependent 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.
 Publication:

Physical Review C
 Pub Date:
 April 1994
 DOI:
 10.1103/PhysRevC.49.1981
 arXiv:
 arXiv:nuclth/9311005
 Bibcode:
 1994PhRvC..49.1981J
 Keywords:

 21.65.+f;
 24.10.Jv;
 Nuclear matter;
 Relativistic models;
 Nuclear Theory
 EPrint:
 14 pages in ReVTeX, 3 uuencoded figures are available upon request, FSUSCRI93132 and ADP93223/T140