A chiral bag model approach to delta electroproduction

Abstract

Helicity amplitudes for the ${\gamma }^{\ast }N\to \Delta$ transition are calculated using the cloudy bag model. A correction for center-of-mass motion is carried out using a modified Peierls-Thouless projection method. This reduces the magnitude of the transition amplitudes at small momentum transfer and enhances them at modest momentum transfers. Our calculation shows that the pion cloud contributes substantially to the transition helicity amplitudes, with the final result giving reasonable agreement with the corresponding experimental values.

16 pages, 6 ps figures, revtex

Cited by in corpus (52)

• Baryons as relativistic three-quark bound states
• Electromagnetic excitation of the Delta(1232)-resonance
• Nucleon and hadron structure changes in the nuclear medium and impact on observables
• Electroexcitation of nucleon resonances
• In-medium electron-nucleon scattering
• Electromagnetic Form Factors of the Nucleon in an Improved Quark Model
• Electromagnetic form factors of the bound nucleon
• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• D-state effects in the electromagnetic N-Delta transition
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• Valence quark contribution for the gamma N -> Delta quadrupole transition extracted from lattice QCD
• Measurements of $ep\to e^{\prime }{\pi }^{+}n$ at W = 1.6 - 2.0 GeV and extraction of nucleon resonance electrocouplings at CLAS
• Fock terms in the quark-meson coupling model
• Signatures of chiral dynamics in the Nucleon to Delta transition
• Chiral symmetry and the Delta-Nucleon transition form factors
• Nucleon to Delta electromagnetic transition in the Dyson-Schwinger approach
• Hadron structure at low Q^2
• Medium dependence of the bag constant in the quark-meson coupling model
• A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition
• Measurements of the gamma*p->Delta Reaction At Low Q^2: Probing the Mesonic Contribution
• Radiative decays of the Sigma0(1385) and Lambda(1520) hyperons
• What is the role of the meson cloud in the ${\Sigma }^{\ast 0}\to \gamma \Lambda$ and ${\Sigma }^{\ast }\to \gamma \Sigma$ decays?
• Radiative decays of decuplet hyperons
• Effect of nucleon structure variation on the longitudinal response function
• The neutron charge form factor in helium-3
• Electromagnetic nucleon-delta transition in the perturbative chiral quark model
• The electroproduction of the $\Delta$(1232) in the chiral quark-soliton model
• Radiative Decays of Decuplet Baryons, $\Lambda (1405)$ and $\Lambda (1520)$ Hyperons
• Parametrizations of the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors and Siegert's theorem
• Measurements of the γ* p --> Δ(1232) reaction at low Q2
• Electroexcitation of the ${\Delta }^{+}(1232)$ at low momentum transfer
• Extracting meson-baryon contributions to the electroexcitation of the $N(1675){\frac{5}{2}}^{-}$ nucleon resonance
• Electroexcitation of the Delta(1232)3/2+ and Delta(1600)3/2+ in a light-front relativistic quark model
• A chiral quark model for meson electro-production in the S11 partial wave
• New low-$Q^2$ measurements of the ${\gamma }^{\ast }N\to \Delta (1232)$ Coulomb quadrupole form factor, pion cloud parametrizations and Siegert's theorem
• On the extraction of electromagnetic properties of the Delta(1232) excitation from pion photoproduction
• Transition magnetic moments of $J^P={\frac{3}{2}}^{+}$ decuplet to $J^P={\frac{1}{2}}^{+}$ octet baryons in the chiral constituent quark model
• Nucleon-to-Delta transition form factors in chiral effective field theory using the complex-mass scheme
• Axial amplitudes for Delta excitation in chiral quark models
• $\Delta$(1232) electroproduction amplitudes in chiral soliton models of the nucleon
• Scaling law for the electromagnetic form factors of the proton
• Electromagnetic transition form factors, $E2/M1$ and $C2/M1$ ratios of the baryon decuplet
• Q^2-evolution of nucleon-to-resonance transition form factors in a QCD-inspired vector-meson-dominance model
• Nucleon to $\Delta$ transition form factors and empirical transverse charge densities
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• Eta and kaon production in a chiral quark model
• Combined parametrization of the neutron electric form factor and the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors
• Direct calculation of the K-matrix for pion electro-production in the Delta channel
• Meson cloud contributions to the Dalitz decays of decuplet to octet baryons
• Quark model study of the $\pi N\to \pi N$ reactions up to the $N(1440)$ resonance region
• Electromagnetic polarizabilities of the spin-$\frac{3}{2}$ baryons in heavy baryon chiral perturbation theory
• Pion electroproduction measurements in the nucleon resonance region