  We calculate the width of the Theta(1540) pentaquark in a relativistic model
in which the pentaquark is considered to be composed of a scalar diquark and a
spin 1/2 triquark. We consider both positive and negative parity for the
pentaquark. There is a single parameter in our model which we vary and which
describes the size of the pentaquark. If the pentaquark size is somewhat
smaller than that of the nucleon, we find quite small widths for the pentaquark
of about 1 MeV or less. Our model of confinement plays an important role in our
analysis and makes it possible to use Feynman diagrams to describe the decay of
the pentaquark.
