{eta} mesons in nuclear matter
{eta} mesons in nuclear matter
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DOI：
10.1103/physrevc.73.015205
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发表时间：
2005-06
影响因子：
3.1
通讯作者：
X. Zhong;G. Peng;Lei Li;P. Ning
中科院分区：
文献类型：
--
作者：
X. Zhong;G. Peng;Lei Li;P. Ning
The {eta}-nucleon ({eta}N) 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 {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 {+-} 130 MeV. The off-shell terms are also important to the in-medium properties of the {eta} meson. On application of the latest determination of the {eta}N scattering length, the ratio of the {eta}-meson effective mass to its vacuum value is near 0.84{+-}0.015, whereas the optical potential is about -(83{+-}5) MeV, at the normal nuclear density.
The {eta}-nucleon ({eta}N) 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 {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 {+-} 130 MeV. The off-shell terms are also important to the in-medium properties of the {eta} meson. On application of the latest determination of the {eta}N scattering length, the ratio of the {eta}-meson effective mass to its vacuum value is near 0.84{+-}0.015, whereas the optical potential is about -(83{+-}5) MeV, at the normal nuclear density.