Insights into the gamma* N -> Delta transition

Abstract

The γ* N -> Δ(1232) transition is a window on hadron shape deformation, the applicability of perturbative QCD at moderate momentum transfers, and the influence of nonperturbative phenomena on hadronic observables. We explain that the Ash-convention magnetic transition form factor must fall faster than the neutron's magnetic form factor and nonzero values for the associated quadrupole ratios reveal the impact of quark orbital angular momentum within the nucleon and Δ(1232); and show that these quadrupole ratios do approach their predicted asymptotic limits, albeit slowly.

6 pages, 5 figures. To appear in Phys. Rev. C (Rapid Comm.)

References in corpus (10)

• Electromagnetic excitation of the Delta(1232)-resonance
• Dressed-quark anomalous magnetic moments
• Abelian anomaly and neutral pion production
• pi- and rho-mesons, and their diquark partners, from a contact interaction
• Flavor decomposition of the elastic nucleon electromagnetic form factors
• Pion form factor from a contact interaction
• Masses of ground and excited-state hadrons
• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• Delta and Omega electromagnetic form factors in a Dyson-Schwinger/Bethe-Salpeter approach
• Measurements of the gamma*p->Delta Reaction At Low Q^2: Probing the Mesonic Contribution

Cited by in corpus (33)

• Baryons as relativistic three-quark bound states
• Explanation and Prediction of Observables using Continuum Strong QCD
• The pion: an enigma within the Standard Model
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Nucleon and $\Delta$ elastic and transition form factors
• Symmetry preserving truncations of the gap and Bethe-Salpeter equations
• Masses of ground-state mesons and baryons, including those with heavy quarks
• Leading-twist parton distribution amplitudes of S-wave heavy-quarkonia
• Parton distribution amplitudes of light vector mesons
• Three Lectures on Hadron Physics
• Elastic and transition form factors of the Δ(1232)
• Nucleon tensor charges and electric dipole moments
• Charmed mesons with a symmetry-preserving contact interaction
• Contact interaction analysis of pion GTMDs
• Contact-interaction Faddeev equation and, inter alia, proton tensor charges
• Parity partners in the baryon resonance spectrum
• Nucleon elastic form factors at accessible large spacelike momenta
• Dissecting nucleon transition electromagnetic form factors
• Electromagnetic Transition Form Factors of Baryon Resonances
• Transition form factors: ${\gamma }^{\ast }+p\to \Delta (1232)$, $\Delta (1600)$
• Spectrum and structure of octet and decuplet baryons and their positive-parity excitations
• Zero mode in a strongly coupled quark gluon plasma
• N* Structure and Strong QCD
• New low-$Q^2$ measurements of the ${\gamma }^{\ast }N\to \Delta (1232)$ Coulomb quadrupole form factor, pion cloud parametrizations and Siegert's theorem
• Combined parametrization of the neutron electric form factor and the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors
• Electromagnetic baryon form factors in the Poincare-covariant Faddeev approach
• Structure of the orbital excited $N^{\ast }$ from the Schwinger-Dyson equations
• The Charm and Beauty of Strong Interactions
• Elastic and Transition Form Factors in DSEs
• ${\gamma }_{\mathbf{v}}\mathbf{N}{\mathbf{N}}^{\ast }$ Electrocouplings in Dyson-Schwinger Equations
• Nucleon-to-Resonance Form Factors at Large Photon Virtualities
• Flavour decomposition of electromagnetic transition form factors of nucleon resonances
• Valence-quark structure N* resonances from DSEs