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Relativistic Quark Model Calculation of the l1, l2 Coefficients of the Chiral Lagrangian

Felipe J. Llanes-Estrada, Pedro Bicudo

hep-pharXiv:hep-ph/0212182

Abstract

We briefly report on a relativistic quark model scheme to calculate the O(P4) pion-pion vertex in the planar approximation and in the chiral limit. The calculation is reduced to the solution of simple integral equations (Bethe-Salpeter like) by an effective use of chiral Ward Identities. Specific model computations are provided.

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