2004/02/29 by M. Cristoforetti, P. Faccioli, Pietro Faccioli +3 · 2 citations
Physics and Astronomy · #Amplitude #Baryon #Diquark #Hadron #High-Energy Particle Collisions Research #Hyperon #Instanton #Lattice (music) #Octet #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Quark model #Quarkonium #hep-ph
paper · pdf · doi:10.1103/physrevd.70.054016
published as Phys.Rev. D70 (2004) 054016 · Final version to appear on PRD
arxiv created 2004/08/02 · openalex publication_date 2004/09/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
This work is devoted to the study of the nonperturbative contributions in nonleptonic hyperon decays. We show that the instanton-induced 't Hooft interaction can naturally explain the \ensuremathΔI=1/2 rule, by generating quark-diquark clustering inside octet baryons. We compute P-wave and S-wave amplitudes in the instanton liquid model, and find good agreement with experiment. We propose a model-independent procedure to test on the lattice if the leading quark-quark attraction in the 0+ antitriplet channel responsible for diquark structures in hadrons is originated by the interaction generated by quasiclassical fields or if it is predominantly due to other perturbative and/or confining forces.