2000/05/31 by Hilmar Forkel · 43 citations
Mathematics · Physics and Astronomy · #Glueball #High-Energy Particle Collisions Research #Instanton #Mathematical physics #Mathematics #Operator product expansion #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum electrodynamics #Scalar (mathematics) #hep-ph
paper · pdf · doi:10.1103/physrevd.64.034015
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 64(3) (American Physical Society) · 15 pages, 3 figures; discussion extended, results and conclusions unchanged, as published in Phys.Rev.D
openalex publication_date 2001/07/06 · arxiv created 2002/01/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The impact of QCD instantons on scalar glueball properties is studied in the framework of an instanton-improved operator product expansion (IOPE) for the 0++ glueball correlation function. Direct instanton contributions are found to strongly dominate over those from perturbative fluctuations and soft vacuum fields. All IOPE sum rules, including the one involving a subtraction constant, show a high degree of stability and are, in contrast to previous glueball sum rules, consistent with the low-energy theorem for the zero-momentum correlator. The predicted glueball mass mG=1.53\ifmmode±\else\textpm\fi0.2 GeV is less sensitive to the instanton contributions then the glueball coupling (residue) fG=1.01\ifmmode±\else\textpm\fi0.25 GeV, which increases by about half an order of magnitude. Both glueball properties are shown to obey scaling relations as a function of the average instanton size and density.