1992/10/05 by Hai-Yang Cheng, Cheng, Hai-Yang
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9210209
15 pages (input of phyzzx.tex is required), IP-ASTP-17-92
arxiv created 1992/10/05 · openalex publication_date 1992/10/05 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In pure chiral perturbation theory (ChPT) the couplings of higher order Lagrangian terms are running parameters and hence can be determined only empirically from various low-energy hadronic processes. While this scenario works well for strong interactions, it is unsatisfactory for nonleptonic and radiative nonleptonic weak interactions: It is impossible, from the outset, to determine all unknown higher-order chiral couplings by experiment; theory is tested only by certain chiral constraints rather than by its quantitative predictions. Based on a QCD-motivated model for p4 strong chiral Lagrangian valid in the limit of large Nc, one can derive large-Nc fourth-order effective chiral Lagrangians for ΔS=1 nonleptonic weak interactions and radiative weak transitions. Applications to K\riπππ,~K\riπγγ, and K\riππγ are discussed.