Molecular Interpretation of the X(3872)

The discovery of the X(3872) in the 3\pi J/\psi mode is compelling evidence for its molecular nature. A successful prediction of this decay mode and other predictions are reviewed here.Comment: 3 pages, ICHEP proceeding

Beyond the Constituent Quark Model

Modern experiment requires a reliable theoretical framework for low energy QCD. Some of the requirements for constructing a new model of QCD are presented here. Progress toward these requirements are highlighted.Comment: 10 pages, 5 ps figures, based on a plenary talk at Hadron 2001, Protvino, Russi

XYZ States: Theory Overview

Various ideas associated with exotic hadrons, and hadronic structure in general, are briefly reviewed.Comment: 6 pages, Proceedings of Hadron201

The Gluon Propagator with Two-loop Schwinger-Dyson Equations

Gluon, ghost, and quark propagators are computed in the Schwinger-Dyson formalism. The full set of one-loop and two-loop contributions to the gap equations are evaluated for the first time. A new and efficient method for dealing with quadratic divergences is presented and a consistent renormalization method is proposed. We find that the two-loop contribution to the propagators is subleading, good fits to lattice data are possible, and reliable vertex models are important to obtaining desired ultraviolet, infrared, and gauge-symmetric behavior.Comment: 13 pages, 6 figures. v2: new figures, added references and discussio