Redundance of Δ-isobar Parameters in Effective Field Theories
Hua-Bin Tang, Paul J. Ellis
Abstract
It is shown that the off-shell parameters in the interaction Lagrangian of pions, nucleons, and Δ-isobars are redundant in the framework of effective field theories. Our results also suggest the necessity of including the Δ as an explicit dynamical degree of freedom.
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