2005/06/30 by X. Zhong, X. H. Zhong, G. X. Peng +4 · 19 citations
Physics and Astronomy · #Baryon #Chiral perturbation theory #High-Energy Particle Collisions Research #Meson #Nuclear matter #Nuclear physics #Nuclear physics research studies #Nucleon #Order (exchange) #Particle physics #Perturbation theory (quantum mechanics) #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #nucl-th
paper · pdf · doi:10.1103/physrevc.73.015205
published in Physical Review C 73(1) (American Institute of Physics) · 8 pages, 3 figures, to appear in PRC, many modifications
arxiv created 2005/11/27 · openalex publication_date 2006/01/31 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The \ensuremathη-nucleon (\ensuremathηN) interactions are deduced from the heavy-baryon chiral perturbation theory to the next-to-leading-order terms. Combining the relativistic mean-field theory for nucleon system, we have studied the in-medium properties of the \ensuremathη meson. We find that all the elastic-scattering \ensuremathηN interactions come from the next-to-leading-order terms. The \ensuremathηN sigma term is found to be about 280 \ifmmode±\else\textpm\fi 130 MeV. The off-shell terms are also important to the in-medium properties of the \ensuremathη meson. On application of the latest determination of the \ensuremathηN scattering length, the ratio of the \ensuremathη-meson effective mass to its vacuum value is near 0.84\ifmmode±\else\textpm\fi0.015, whereas the optical potential is about \ensuremath-(83\ifmmode±\else\textpm\fi5) MeV, at the normal nuclear density.