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Mass and width of the Delta(1232) resonance using complex-mass renormalization
classification
⚛️ nucl-th
hep-lathep-ph
keywords
complex-massdeltamassrenormalizationresonanceschemewidthbehavior
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We discuss the pole mass and the width of the $\Delta(1232)$ resonance to third order in chiral effective field theory. In our calculation we choose the complex-mass renormalization scheme (CMS) and show that the CMS provides a consistent power-counting scheme. In terms of the pion-mass dependence, we compare the convergence behavior of the CMS with the small-scale expansion (SSE).
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