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Instantons, diquarks and non-leptonic weak decays of hyperons

M. Cristoforetti·P. Faccioli·E. V. Shuryak·M. Traini
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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.

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M. Cristoforetti, P. Faccioli, E. V. Shuryak, M. Traini. 2004-08-02. Instantons, diquarks and non-leptonic weak decays of hyperons. https://doi.org/10.1103/physrevd.70.054016

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