A Diquark-Triquark Model for the KN Pentaquark

Abstract

We propose a model for the recently discovered Theta^+ exotic KN resonance as a novel kind of a pentaquark with an unusual color structure: a color triplet (ud) diquark, coupled to a color anti-triplet (ud s-bar) triquark in a relative P-wave. The state has J^P=1/2^+, I=0 and is an antidecuplet of SU(3)_f. A rough mass estimate of this pentaquark is close to experiment.

Comments: A condensed and amended version of hep-ph/0307243, as published in PLB, to include pentaquark analysis only, with a revised title and some additional discussion of the Xi states in the 10-bar