Interaction of the ${\Theta }^{+}$ with the nuclear medium

Abstract

We study the selfenergy of the ${\Theta }^{+}$ pentaquark in nuclei associated with two types of interaction: the KN decay of the ${\Theta }^{+}$ and two meson baryon decay channels of the ${\Theta }^{+}$. Whereas the potential related to the first source is quite weak, the second kind of interaction produces a large and attractive potential that could lead to the existence of ${\Theta }^{+}$ nuclear bound states.

Comments: 8 pages, 6 figurs, talk presented at the International Workshop PENTAQUARK04 July 20-23, 2004, SPring-8, Japan