2004/11/30 by Pietro Faccioli, PIETRO FACCIOLI
Physics and Astronomy · #Diquark #Hadron #High-Energy Particle Collisions Research #Hyperon #Instanton #Momentum (technical analysis) #Particle physics theoretical and experimental studies #Perturbative QCD #Pion #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Scalar (mathematics) #hep-ph
paper · pdf · doi:10.1142/s0217751x05028284
published as Int.J.Mod.Phys. A20 (2005) 4615-4621 · Summary of the results presented at the "8th Workshop on Non-perturbative Quantum Chromodynamics", Paris 7-11 June 2003, the "26th International School on Nuclear Physics", Erice 16-24 September 2004, and the "X Convegno sui Problemi della Fisica Nucleare Teorica", Cortona, 6-9 October 2004
arxiv created 2004/12/23 · openalex publication_date 2005/07/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
QCD instantons generate non-perturbative spin- and flavor- dependent correlations between light quarks. We report on the results of a series of studies on the contribution of instantons to the electro-weak structure of light hadrons. We show that the Instanton Liquid Model can reproduce the available data on proton and pion form factors at large momentum transfer, and explain the delay of the onset of the perturbative regime in some exclusive reactions. We provide unambiguous evidence that instantons lead to the formation of a deeply bound scalar, color anti-triplet diquark, with a mass of about 450 MeV. The strong attraction in the [Formula: see text], scalar diquark channel leads to a quantitative description of non-leptonic decays of hyperons and provides a microscopic dynamical explanation of the Δ I = 1/2 rule.