Large-Nc Higher Order Weak Chiral Lagrangians for Nonleptonic and Radiative Kaon Decays

  • Hai-Yang Cheng


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 p 4 strong chiral Lagrangian valid in the limit of large N c, one can derive large-N c fourth-order effective chiral Lagrangians for ∆S = 1 nonleptonic weak interactions and radiative weak transitions. Applications to Kπππ, Kπγγ, and Kππγ are discussed.


Pole Contribution Dalitz Plot Chiral Anomaly Photon Field Chiral Parameter 
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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Hai-Yang Cheng
    • 1
  1. 1.Institute of PhysicsAcademia SinicaTaipeiTaiwan, Republic of China

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