Dynamics of Multiquark Systems: Mass, Width and Exotics

Abstract

Exotic multi-quark states are examined in the quark model and in QCD. Current status of theoretical studies of the pentaquark Theta^+ is reported. We show recent analyses of multi-quark components of baryons. A novel method to extract a compact excited state in the lattice QCD is applied. We also discuss how to determine mixings of different Fock components in the hadron in the QCD sum rule approach.

Comments: Manuscript prepared for the Proceedings of the 18th International IUPAP Conference on Few-Body Problems in Physics, FB18, held in Santos, Brazil, on August 21-16, 2006, and also for the International workshop on Strangeness Nuclear Physics (SNP2006), held in Zhang Jia Jie, China, on September 5-9, 2006