A Modern Introduction to Quarkonium Theory

Abstract

Recent advances in lattice and continuum QCD have given us new insights into quarkonium physics. These set of lectures are intend for the uninitiated. We first give a physical picture of quarkonium and describe the hybrids states established in lattice QCD. Then we give an unorthodox presentation of Non-Relativistic QCD (NRQCD) including a novel method for the application of spin-symmetries. Finally we describe the prototypical application of NRQCD: cancellation of infrared divergences in decays of P-wave quarkonia.

Comments: 36 pages, 20 figures, Lectures at the first Winter School on "Recent Developements in Hadron Physics" at the APCTP, Seoul, Korea, 1998; corrected some typos