A Perspective on Pentaquarks

Abstract

Recent discoveries of manifestly exotic, narrow baryon resonances present a fundamental challenge for our theoretical understanding of low-energy QCD. This is a brief survey of their interpretation, emphasizing the possibility that diquark correlations are centrally involved. Many predictions and suggestions for future directions follow from that idea.Comment: 8 pages; Plenary talk by FW at the European Physical Society, Aachen, August 2003; proposed operator for 1/2+ pentaquark lattice simulation corrected; references adde