Eta Mesons In Hot And Dense Asymmetric Nuclear Matter
PHYSICAL REVIEW C(2020)
摘要
We study the eta N interactions in the hot and dense isospin asymmetric nuclear matter using two different approaches. In the first approach, the in-medium mass and optical potential of eta meson have been calculated in the chiral SU(3) model, considering the effect of explicit symmetry-breaking term and range terms in the eta N interaction Lagrangian density. In the second scenario, the conjunction of chiral perturbation theory and chiral SU(3) model is employed. In this case, the next to leading order eta N interactions are evaluated from the chiral perturbation theory (ChPT), and the in-medium contribution of scalar densities are taken as input from chiral SU(3) model. We observe a larger negative mass shift in the ChPT + chiral model approach compared to the chiral SU(3) model alone as a function of nuclear density. Moreover, the increase in the asymmetry and temperature cause a decrease in the magnitude of mass shift. We have also studied the impact of TIN scattering length a(eta N) on the eta -meson mass m(eta)* and observed that the inn decrease mores for increasing values of scattering length.
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