$η$-meson in nuclear matter

Details $η$-meson in nuclear matter $η$-meson in nuclear matter

2005-06-07

arxiv.org/abs/nucl-th/0506020v2

Phys. Rev. C 73, 015205 (2006)

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures, to appear in PRC, many modifications

Scientific paper

10.1103/PhysRevC.73.015205

The $\eta$-nucleon ($\eta$N) interactions are deduced from the heavy baryon chiral perturbation theory up to the next-to-leading-order terms. Combining the relativistic mean-field theory for nucleon system, we have studied the in-medium properties of $\eta$-meson. We find that all the elastic scattering $\eta$N interactions come from the next-to-leading-order terms. The $\eta $N sigma term is found to be about 280$\pm$130 MeV. The off-shell terms are also important to the in-medium properties of $\eta$-meson. On application of the latest determination of the $\eta$N scattering length, the ratio of $\eta$-meson effective mass to its vacuum value is near $0.84\pm0.015$, while the optical potential is about $-(83\pm5)$ MeV, at the normal nuclear density.

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