Density dependence of meson - nucleon vertices in nuclear matter
arXiv:nucl-th/9806062 · doi:10.1016/S0375-9474(98)00561-2
Abstract
Changes in the meson-nucleon coupling constant and the vertex form factor in nuclear matter are studied in a modified Skyrme Lagrangian including the sigma-meson field that satisfies the scale invariance. Renormalization of the axial-vector coupling constant, and the nucleon mass are studied in a consistent model. The results are consistent with the empirical evidence. A calculation of pi N commutator, sigma-term, indicates that the medium changes its magnitude considerably.
16 pages, epsfig.sty, 5 figures (Ps).The section "Discussions and summary" has been rewritten. Accepted for publication in Nucl. Phys. A