In-medium Properties of $Θ^{+}$ as a K$π$N structure in Relativistic Mean Field Theory

Details In-medium Properties of $Θ^{+}$ as a K$π$N structure in Relativistic Mean Field Theory In-medium Properties of $Θ^{+}$ as a K$π$N structure in Relativistic Mean Field Theory

2005-01-26

arxiv.org/abs/nucl-th/0501064v2

Phys. Rev.C 72, 065212 (2005)

Physics

Nuclear Physics

Nuclear Theory

8 pages, 5 figures

Scientific paper

10.1103/PhysRevC.72.065212

The properties of nuclear matter are discussed with the relativistic mean-field theory (RMF).Then, we use two models in studying the in-medium properties of $\Theta^+$: one is the point-like $\Theta^*$ in the usual RMF and the other is a K$\pi$N structure for the pentaquark. It is found that the in-medium properties of $\Theta^+$ are dramatically modified by its internal structure. The effective mass of $\Theta^+$ in medium is, at normal nuclear density, about 1030 MeV in the point-like model, while it is about 1120 MeV in the model of K$\pi$N pentaquark. The nuclear potential depth of $\Theta^+$ in the K$\pi$N model is approximately -37.5 MeV, much shallower than -90 MeV in the usual point-like RMF model.

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