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paper

Massive States in Chiral Perturbation Theory

arXiv:hep-ph/9410344 · doi:10.1007/BF01579813

Abstract

It is shown that the chiral nonanalytic terms generated by $Δ_{33}$ resonance in the nucleon self-energy is reproduced in chiral perturbation theory by perturbing appropriate local operators contained in the pion-nucleon effective Lagrangian itself.

9 pages, SINP-TNP/94-10