Extraction and interpretation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>N</mml:mi><mml:mo>→</mml:mo><mml:mi>Δ</mml:mi></mml:mrow></mml:math>form factors within a dynamical model

Juliá-Dı́az, B.; Lee, T.-S.H.; Satô, Tôru; Smith, L. C.

doi:10.1103/physrevc.75.015205

Cited by 99 publications

(238 citation statements)

References 44 publications

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“…In non-relativistic quark models, non-zero values for these ratios would require d−wave components in the nucleon and ∆ wave functions or the inclusion of pion-cloud effects. Indeed, the analysis of pion electroproduction data via dynamical reaction models suggests that these ratios are almost entirely dominated by meson-baryon interactions [613].…”

Section: Nucleon Transition Form Factorsmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

406

530

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We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the DysonSchwinger framework with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.

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Section: Nucleon Transition Form Factorsmentioning

confidence: 99%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

406

530

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“…The ratios of the PGI FFs F 1,3 /F 2 extracted from the available experimental data [6,7,8,9,10,11,12,13,14] on R EM and R SM are depicted in Fig. 1.…”

Section: Data Analysis and The Quasi-scalingmentioning

confidence: 99%

“…At the experimentally accessible energies, however, the asymptotic scaling behavior of the FFs seems not to be apparent. For instance, the measurements of the electromagnetic ratio R EM (Q 2 ) of the ∆(1232) resonance [6,7,8,9,10,11,12,13,14] indicate that it remains to be small and negative up to the momentum transfer Q 2 = 7 GeV 2 , which disagrees sharply with the pQCD scaling R EM (Q 2 → +∞) = +1 [16,17]. It is possible that the transition to the scaling may not occur up to extremely large momentum transfers Q 2 ≫ 20 GeV 2 [18,19].…”

Section: Introductionmentioning

confidence: 99%

Low-Q2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition

Vereshkov

Volchanskiy

2010

Physics Letters B

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We address the issue of the scaling behavior of the nucleon electromagnetic form factors (FFs). We propose a consistent Lagrangian of the electromagnetic N∆ (1232)-interaction possessing all the internal symmetries of the spin-3 2 baryon resonance, point and gauge invariance. The point and gauge invariant FFs may exhibit quasi-scaling behavior-while the FFs do not reach asymptotic scaling domain, the ratios thereof do. The hypothesis of the quasi-scaling is in good agreement with the experimental data available at Q 2 0.4 GeV 2 .

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“…Among those studies, the ones with dynamical-model approaches have further revealed the crucial role of (multichannel) reaction dynamics in understanding the mass spectrum, structure, and dynamical origin of baryon resonances (see, e.g., Refs. [11,12]). Similar studies based on a dynamical-model approach have also performed recently by us for the Λ * and Σ * sector [13,14].…”

Section: Introductionmentioning

confidence: 99%