Instantons, diquarks and non-leptonic weak decays of hyperons

Abstract

This work is devoted to the study of the non-perturbative contributions in non-leptonic hyperon decays. We show that the instanton-induced 't Hooft interaction can naturally explain the Delta I=1/2 rule, by generating quark-diquark clustering inside octet baryons. We compute P-wave and S-wave amplitudes in the Instanton Liquid Model (ILM), 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^+ anti-triplet channel responsible for diquark structures in hadrons is originated by the interaction generated by quasi-classical fields or it is predominantly due to other perturbative and/or confining forces.

arXiv commentFinal version to appear on PRD

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Cited by in corpus (13)

• An interacting quark-diquark model of baryons
• QCD Topology at Finite Temperature: Statistical Mechanics of Selfdual Dyons
• Are There Diquarks in the Nucleon?
• Exploring the Chiral Regime of QCD in the Interacting Instanton Liquid Model
• Light scalar tetraquarks from a holographic perspective
• Comments on Diquarks, Strong Binding and a Large Hidden QCD Scale
• Leading twist moments of the neutron structure function F2n
• Computing the Effective Hamiltonian of Low-Energy Vacuum Gauge Fields
• Instantons, Chiral Dynamics and Hadronic Resonances
• Instanton-Induced Correlations in Hadrons
• Analysis of the nonleptonic two-body decays of the $\Lambda$ hyperon
• Quantum Interactions Between Non-Perturbative Vacuum Fields
• Instanton fermionic zero mode at finite temperature and chemical potential