Including the Delta(1232) resonance in baryon chiral perturbation theory

C. Hacker , N. Wies , J. Gegelia , S. Scherer

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classification ✦ hep-ph

keywords deltatheorybaryonchiralperturbationapplicationsconsideredcounting

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Baryon chiral perturbation theory with explicit $\Delta(1232)$ degrees of freedom is considered. Using the extended on-mass-shell renormalization scheme, a manifestly Lorentz-invariant effective field theory with a systematic power counting is obtained. As applications we discuss the mass of the nucleon, the pion-nucleon sigma term, and the pole of the $\Delta$ propagator.

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Including the Delta(1232) resonance in baryon chiral perturbation theory

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