1995/02/02 by Vésteinn Thórsson, Vesteinn Thorsson, Andreas Wirzba +1 · 2 citations
Physics and Astronomy · #Amplitude #Chiral perturbation theory #Effective field theory #Eta meson #High-Energy Particle Collisions Research #Meson #Nuclear matter #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #Scattering amplitude #hep-ph #nucl-th
paper · pdf · doi:10.1016/0375-9474(95)00166-x
published as Nucl.Phys.A589:633-648,1995 · 23 pages, LaTeX, 2 Postscript figures (fig1.ps, fig2.ps)
arxiv created 1995/02/02 · openalex publication_date 1995/07/01 · arxiv updated 2016/09/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Chiral effective lagrangians may differ in their prediction of meson-nucleon scattering amplitudes off-meson-mass-shell, but must yield identical S-matrix elements. We argue that the effective meson mass in nuclear matter obtained from chiral effective lagrangians is also unique. Off-mass-shell amplitudes obtained using the PCAC choice of pion field must therefore not be viewed as fundamental constraints on the dynamics, the determination of the effective meson mass in nuclear matter or the possible existence of meson condensates in the ground state of nuclear matter. This hypothesis is borne out by a calculation of the effective mass in two commonly employed formulations of chiral perturbation theory which yield different meson-nucleon scattering amplitudes off-meson-mass-shell.