Including the Δ(1232) resonance in baryon chiral perturbation theory
C. Hacker, N. Wies, J. Gegelia, S. Scherer
Abstract
Baryon chiral perturbation theory with explicit Δ(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 Δ propagator.
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