Delta(1232)$ resonance in the $\vec{\gamma}p\rightarrow p\pi^0$ reaction at threshold

Phys. Rev. D 93, 094018 (2016) We calculate the neutral pion photoproduction on the proton near threshold in covariant baryon chiral perturbation theory, including the $\Delta(1232)$ resonance as an explicit degree of freedom, up to chiral order $p^{7/2}$ in the $\delta$ counting. We compare our res...

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Bibliographic Details
Main Authors Blin, A. N. Hiller, Ledwig, T, Vacas, M. J. Vicente
Format Journal Article
LanguageEnglish
Published 29.02.2016
Subjects
Physics - High Energy Physics - Phenomenology
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Summary:Phys. Rev. D 93, 094018 (2016) We calculate the neutral pion photoproduction on the proton near threshold in covariant baryon chiral perturbation theory, including the $\Delta(1232)$ resonance as an explicit degree of freedom, up to chiral order $p^{7/2}$ in the $\delta$ counting. We compare our results with recent low-energy data from the Mainz Microtron for angular distributions and photon asymmetries. The convergence of the chiral series of the covariant approach is found to improve substantially with the inclusion of the $\Delta(1232)$ resonance.
DOI:10.48550/arxiv.1602.08967