Electromagnetic Excitation of Nucleon Resonances

Abstract

Recent progress on the extraction of electromagnetic properties of nucleon resonance excitation through pion photo- and electroproduction is reviewed. Cross section data measured at MAMI, ELSA, and CEBAF are analyzed and compared to the analysis of other groups. On this basis, we derive longitudinal and transverse transition form factors for most of the four-star nucleon resonances. Furthermore, we discuss how the transition form factors can be used to obtain empirical transverse charge densities. Contour plots of the thus derived densities are shown for the Delta, Roper, S11, and D13 nucleon resonances.

30 pages, 19 figures, 9 tables

References in corpus (26)

• Unitary Isobar Model - MAID2007
• Extended Partial-Wave Analysis of piN Scattering Data
• Electromagnetic excitation of the Delta(1232)-resonance
• Analytic properties of the scattering amplitude and resonances parameters in a meson exchange model
• Empirical transverse charge densities in the nucleon and the nucleon-to-$\Delta$ transition
• Chiral Effective-Field Theory in the Delta(1232) Region: Pion Electroproduction on the Nucleon
• eta-photoproduction in the resonance energy region
• Eta-meson production in the resonance energy region
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• Dynamical coupled-channels analysis of 1H(e,e'pi)N reactions
• Nucleon to Delta transition form factors with $N_F=2+1$ domain wall fermions
• Empirical transverse charge densities in the nucleon-to-P11(1440) transition
• Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model
• Electroproduction of the N*(1535) resonance at large momentum transfer
• Nucleon resonances in πN scattering up to energies \sqrt(s) < 2.0 GeV
• Measurements of the gamma*p->Delta Reaction At Low Q^2: Probing the Mesonic Contribution
• Empirical transverse charge densities in the deuteron
• First Lattice Study of the $N$-$P_{11}(1440)$ Transition Form Factors
• Singularity structure of the pi N scattering amplitude in a meson-exchange model up to energies W < 2.0 GeV
• The physical meaning of scattering matrix singularities in coupled-channel formalisms
• Neutral Pion Electroproduction in the Resonance Region at High $Q^2$
• On the definition of the Δmass and width
• Dispersion Theory and the Low Energy Constants for Neutral Pion Photoproduction
• Invariant Amplitudes for Pion Electroproduction
• Nucleon Polarizabilities: Theory
• Partial-Wave Analysis of Single-Pion Production Reactions

Cited by in corpus (88)

• Baryons as relativistic three-quark bound states
• Progress Toward Understanding Baryon Resonances
• Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
• 50 Years of Quantum Chromodynamics
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• Progress and open questions in the physics of neutrino cross sections
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• New Results from the Studies of the $N(1440)1/2^{+}$, $N(1520)3/2^{-}$, and $\Delta (1620)1/2^{-}$ Resonances in Exclusive $ep\to e^{\prime }{p}^{\prime }{\pi }^{+}{\pi }^{-}$ Electroproduction with the CLAS Detector
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• Electron- versus neutrino-nucleus scattering
• Pion- and photo-induced transition amplitudes to $\Lambda K$, $\Sigma K$, and $N\eta$
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
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• Constrained gamma-Z interference corrections to parity-violating electron scattering
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Electromagnetic Transition Form Factors of Baryon Resonances
• Nucleon resonance contributions to unpolarised inclusive electron scattering
• Weak charged and neutral current induced one pion production off the nucleon
• Photo- and Electrocouplings of Nucleon Resonances
• Valence quark and meson cloud contributions to the ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors
• Studies of N^* structure from the CLAS meson electroproduction data
• Nucleon resonances in Compton scattering
• Electromagnetic transition form factors of the Roper resonance in effective field theory
• Unified description of hadron-photon and hadron-meson scattering in the Dyson-Schwinger approach
• Effects of a spin-flavour dependent interaction on light-flavoured baryon helicity amplitudes
• More about the light baryon spectrum
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• Nucleon resonances with higher spins in soft-wall AdS/QCD
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• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• Study of the $\gamma p\to {\pi }^0\eta p$ reaction with the A2 setup at MAMI
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• Measurements of the ${\gamma }_{v}p\to p^{\prime }{\pi }^{+}{\pi }^{-}$ cross section with the CLAS detector for $0.4$ GeV${}^2$ $<Q^2<$ $1.0$ GeV${}^2$ and $1.3$ GeV $<W<$ $1.825$ GeV
• The MAID Legacy and Future
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• $N^{\ast }$ Form Factors based on a Covariant Quark Model
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• Neutrino Interactions with Matter and the MiniBooNE anomaly
• A connection between angular dependent phase ambiguities and the uniqueness of the partial wave decomposition
• N* Experiments and their Impact on Strong QCD Physics
• Improved empirical parametrizations of the ${\gamma }^{\ast }N\to N(1535)$ transition amplitudes and the Siegert's theorem
• Modification of electromagnetic structure functions for the $\gamma Z$-box diagram
• Baryon transition form factors at the pole
• Theory introduction to baryon spectroscopy
• New low-$Q^2$ measurements of the ${\gamma }^{\ast }N\to \Delta (1232)$ Coulomb quadrupole form factor, pion cloud parametrizations and Siegert's theorem
• Progress in the calculation of nucleon transition form factors
• Nucleon-to-Delta transition form factors in chiral effective field theory using the complex-mass scheme
• $\gamma N\to N^{\ast }(1535)$ transition in soft-wall AdS/QCD
• 70 Years of Hyperon Spectroscopy: A review of strange $\Xi$, $\Omega$ baryons, and the spectrum of charmed and bottom baryons
• Photon beam asymmetry $\Sigma$ in the reaction $\vec{\gamma }p\to p\omega$ for $E_{\gamma }$ = 1.152 to 1.876 GeV
• Nucleon Resonance Physics
• Electromagnetic form factors of octet baryons in QCD
• Theoretical Analysis of the $p\bar{p}\to {\pi }^0{e}^{+}{e}^{-}$ Process within a Regge Framework
• Structure of Pion Photoproduction Amplitudes
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Unified model of nucleon elastic form factors and implications for neutrino-oscillation experiments
• Pion Photoproduction off Nucleon with Hamiltonian Effective Field Theory
• Resonant contributions to polarized proton structure functions
• Nucleon to $\Delta$ transition form factors and empirical transverse charge densities
• Photon induced K$\Lambda$ production on the proton in the low energy region
• Electromagnetic multipole moments of baryons
• Combined parametrization of the neutron electric form factor and the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors
• Global Data-Driven Determination of Baryon Transition Form Factors
• Space-like Electromagnetic Form Factors of Lambda- and Sigma-Baryons from Quark-Diquark Faddeev Equations
• Contribution of the $a_1$ meson to the axial nucleon-to-$\Delta$ transition form factors
• Resonance Region Structure Functions and Parity Violating Deep Inelastic Scattering
• Leading-order QED radiative corrections to timelike Compton scattering on the proton
• Study of excited nucleons and their structure
• Charged current (anti)neutrino induced eta production off the nucleon
• Information entropy of nuclear electromagnetic transitions in AdS/QCD
• From Experimental Data to Pole Parameters in a Direct Way (Angle Dependent Continuum Ambiguity and Laurent + Pietarinen Expansion)
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• Electromagnetic transition form factors and Dalitz decays of hyperons
• A Relativistic Model for the Electromagnetic Structure of Baryons from the 3rd Resonance Region