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Redundance of $\Delta$-isobar Parameters in Effective Field Theories
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classification
hep-phnucl-th
keywords
deltaeffectivefieldparameterstheoriesdegreedynamicalexplicit
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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.
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