Abstract
Heavy baryon chiral perturbation theory including spin 3/2 delta resonances as effective degrees of freedom is reviewed. The theory admits a systematic expansion in the small scale ε, where ε collectively denotes soft momenta, the pion mass or the delta-nucleon mass difference. Renormalization is discussed in some detail on the example of the scalar sector of one-nucleon processes, and a reformulation of the principle of resonance saturation for counterterms of the HBChPT lagrangian is sketched. As an application, the polarizabilities of the nucleon are discussed at order ε 3.
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Kambor, J. (1998). The Δ(1232) as an effective degree of freedom in chiral perturbation theory. In: Bernstein, A.M., Drechsel, D., Walcher, T. (eds) Chiral Dynamics: Theory and Experiment. Lecture Notes in Physics, vol 513. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0104904
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DOI: https://doi.org/10.1007/BFb0104904
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