Redundance of $\Delta$-isobar Parameters in Effective Field Theories

Abstract

It is shown that the off-shell parameters in the interaction Lagrangian of pions, nucleons, and $\Delta$-isobars are redundant in the framework of effective field theories. Our results also suggest the necessity of including the $\Delta$ as an explicit dynamical degree of freedom.

11 pages, RevTex, no figures, a minor error corrected, to appear in PLB

References in corpus (4)

• Vacuum Contributions in a Chiral Effective Lagrangian for Nuclei
• What is Renormalization?
• Chiral symmetry and the reaction $\gamma p\to {\pi }^{0}p$
• Double neutral pion photoproduction at threshold

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