The width of the $\Delta$-resonance at two loop order in baryon chiral perturbation theory

De-Liang Yao; Dmitrij Siemens; Jambul Gegelia; Ulf-G. Mei{\ss}ner

The width of the $\Delta$-resonance at two loop order in baryon chiral perturbation theory

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arxiv 1608.00517 v1 pith:ICOOS4V2 submitted 2016-08-01 hep-ph

Jambul Gegelia , Ulf-G. Mei{ss}ner , Dmitrij Siemens , De-Liang Yao This is my paper · ORCID

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keywords baryonchiraldeltaleadingorderperturbationresonancetheory

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We calculate the width of the delta resonance at leading two-loop order in baryon chiral perturbation theory. This gives a correlation between the leading pion-nucleon-delta and pion-delta couplings, which is relevant for the analysis of pion-nucleon scattering and other processes.

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Pion photoproduction off nucleons in covariant chiral perturbation theory
hep-ph 2019-08 conditional novelty 5.0 of 10

Including the Delta(1232) resonance in a third-order covariant chiral perturbation theory fit reproduces near-threshold pion photoproduction data across all charge channels far better than leaving it out.

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