Electromagnetic excitation of the Δ(1232)-resonance

By V. Pascalutsa, M. Vanderhaeghen, S. Yang. 2006

248 citations recorded by the source corpus.

We review the description of the lowest-energy nucleon excitation--the Delta(1232)-resonance. Much of the recent effort has been focused on the precision measurements of the nucleon to Delta transition by means of electromagnetic probes. We review the results of those measurements and confront them with the state-of-the-art calculations based on chiral effective-field theories (EFT), lattice QCD, and QCD-inspired models. Some of the theoretical approaches are reviewed in detail. In particular, we describe the chiral EFT of QCD in the energy domain of the Delta-resonance, and its applications to the electromagnetic nucleon-to-Delta transition (gamma N Delta). We also describe the recent dynamical and unitary-isobar models of pion electroproduction which are extensively used in the extraction of the gamma* N Delta form factors from experiment. Furthermore, we discuss the link of the gamma* N Delta form factors to generalized parton distributions (GPDs), as well as the predictions of perturbative QCD for these transition form factors. The present status of understanding the Delta-resonance properties and the nature of its excitation is summarized.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/d140ff4119626911549d5f78b2c420c11a3e3158

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In Nuclear and High Energy Physics

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Baryons as relativistic three-quark bound states (2016, background): “[4, 11, 13, 55, 56] for details and a comprehensive list of references.”