In-medium Properties of η in Chiral Perturbation Theory
نویسنده
چکیده
An effective Lagrangian for ηN interaction in nuclear medium is deduced from the chiral perturbation theory. The energy, effective mass and optical potential of η mesons as functions of nuclear density are obtained. Our results show that there is strong attractive η nuclear interaction at normal nuclear density, and in-medium properties of η depend strongly on the off-shell term which is determined by the ηN scattering length. The effective mass ranges 0.9 to 0.75mη and the optical potential ranges −45 to −130 MeV at normal nuclear density corresponding to the ηN scattering length 0.25 ∼ 1.05 fm. PACS: 21.65.+f, 21.30.Fe
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