QCD GLUEBALL SUM RULES AND VACUUM TOPOLOGY

摘要

Several key problems of QCD sum rules in the spin-0 glueball channels areresolved by implementing nonperturbative short-distance physics from directinstantons and topological charge screening. A lattice-based instanton size dis-tribution and the IR renormalization of the nonperturbative Wilson coefficientsare also introduced. Results of a comprehensive quantitative sum rule analysisare reviewed and their implications discussed.