Bound states of ${\Theta }^{+}$ in nuclei

Abstract

We study the binding energy and the width of the ${\Theta }^{+}$ in nuclei, associated to the $KN$ and $K\pi N$ components. The first one leads to negligible contributions while the second one leads to a sizeable attraction, enough to bind the ${\Theta }^{+}$ in nuclei. Pauli blocking and binding effects on the $KN$ decay reduce considerably the ${\Theta }^{+}$ decay width in nuclei and medium effects associated to the $K\pi N$ component also lead to a very small width, as a consequence of which one finds separation between the bound levels considerably larger than the width of the states.

Comments: Presentation in the 10th International Baryon Conference BARYON04