Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Abstract

We present results on the electroexcitation of the low mass resonances Delta(1232)P33, N(1440)P11, N(1520)D13, and N(1535)S11 in a wide range of Q2. The results were obtained in the comprehensive analysis of JLab-CLAS data on differential cross sections, longitudinally polarized beam asymmetries, and longitudinal target and beam-target asymmetries for pion electroproduction off the proton. The data were analysed using two conceptually different approaches, fixed-t dispersion relations and a unitary isobar model, allowing us to draw conclusions on the model sensitivity of the obtained electrocoupling amplitudes. The amplitudes for the Delta(1232)P33} show the importance of a meson-cloud contribution to quantitatively explain the magnetic dipole strength, as well as the electric and scalar quadrupole transitions. They do not show any tendency of approaching the pQCD regime for Q2<6 GeV2. For the Roper resonance, N(1440)P11, the data provide strong evidence for this state as a predominantly radial excitation of a 3-quark ground state. Measured in pion electroproduction, the transverse helicity amplitude for the N(1535)S11 allowed us to obtain the branching ratios of this state to the piN and etaN channels via comparison to the results extracted from eta electroproduction. The extensive CLAS data also enabled the extraction of the gamma*p -> N(1520)D13 and N(1535)S11 longitudinal helicity amplitudes with good precision.

23 pages, 17 figures

References in corpus (59)

• A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
• Unitary Isobar Model - MAID2007
• Extended Partial-Wave Analysis of piN Scattering Data
• Electromagnetic excitation of the Delta(1232)-resonance
• Chiral Dynamics and the $S_{11}(1535)$ Nucleon Resonance
• Global analysis of proton elastic form factor data with two-photon exchange corrections
• Determination of the Charged Pion Form Factor at Q2=1.60 and 2.45 (GeV/c)2
• Chiral unitary approach to S-wave meson baryon scattering in the strangeness S=0 sector
• What is the structure of the Roper resonance?
• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Determination of the pion charge form factor for Q^2=0.60-1.60 GeV^2
• Baryon Current Matrix Elements in a Light-Front Framework
• $Q^2$ Dependence of Quadrupole Strength in the ${\gamma }^{\ast }p\to {\Delta }^{+}(1232)\to p{\pi }^0$ Transition
• On baryon resonances and chiral symmetry
• Analysis of Pion Photoproduction Data
• Dynamical Study of the Delta Excitation in N(e,e' pi) Reactions
• Electroproduction of the Delta Resonance at High Momentum Transfer
• Updated resonance photo-decay amplitudes to 2 GeV
• Measurements of GEn/GMn from the ^2H(vec{e},e'vec{n})^1H Reaction to Q^2=1.45 (GeV/c)^2
• The $S_{11}-N$(1535) and $-N$(1650) Resonances in Meson-Baryon Unitarized Coupled Channel Chiral Perturbation Theory
• Dispersion Relation Constrained Partial Wave Analysis of piN Elastic and piN\to\etaN Scattering Data: The Baryon Spectrum
• Nucleon and pion electromagnetic form factors in a light-front constituent quark model
• Pion cloud and the $Q^2-$dependence of ${\gamma }^{\ast }N\leftrightarrow \Delta$ transition form factors
• gamma* N -> Delta transition form factors: a new analysis of the JLab data on p(e,e'p)pi0 at Q^2=2.8 and 4.0 (GeV/c)^2
• Comment on "Mass and K Lambda coupling of N*(1535)"
• Mass and $K\Lambda$ coupling of $N^{\ast }(1535)$
• The e p -> e' p eta reaction at and above the S11(1535) baryon resonance
• Investigation of the conjectured nucleon deformation at low momentum transfer
• Measurement of the N to Delta(1232) Transition at High Momentum Transfer by pi0 Electroproduction
• A Precise Measurement of the Neutron Magnetic Form Factor GMn in the Few-GeV2 Region
• Electromagnetic transition form factors of negative parity nucleon resonances
• Q^2 Dependence of the S_{11}(1535) Photocoupling and Evidence for a P-wave resonance in eta electroproduction
• Electroproduction of the S11(1535) Resonance at High Momentum Transfer
• Multipole Amplitudes of Pion Photoproduction on Nucleons up to 2GeV within Dispersion Relations and Unitary Isobar Model
• Dynamical Coupled-Channels Effects on Pion Photoproduction
• Electroexcitation of the P33(1232), P11(1440), D13(1520), S11(1535) at Q^2=0.4 and 0.65(GeV/c)^2
• The nucleon to Delta electromagnetic transition form factors in lattice QCD
• The role of $N^{\ast }(1535)$ in $pp\to pp\varphi$ and ${\pi }^{-}p\to n\varphi$ reactions
• Electroexcitation of the Roper resonance for 1.7 < Q2 < 4.5 GeV2 in ep -> enpi+
• Baryon Form Factors of Relativistic Constituent-Quark Models
• Single pi+ Electroproduction on the Proton in the First and Second Resonance Regions at 0.25GeV^2 < Q^2 < 0.65GeV^2 Using CLAS
• Electroexcitation of nucleon resonances at Q^2=0.65 GeV/c^2 from a combined analysis of single- and double-pion electroproduction data
• Recoil Polarization for Delta Excitation in Pion Electroproduction
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }p){\pi }^o$ in the $\Delta (1232)$ Resonance Region
• Cross sections and beam asymmetries for $\vev{e}p \to enπ^+$ in the nucleon resonance region for $1.7\le Q^2\le 4.5(GeV{)}^2$
• Electroexcitation of the Roper resonance in the relativistic quark models
• Lowest Q^2 Measurement of the gamma*p -> Delta Reaction: Probing the Pionic Contribution
• Single Quark Transition Model Analysis of Electromagnetic Nucleon Resonance Transitions in the [70,1-] Supermultiplet
• Resonance Contributions to $\eta$ Photoproduction on Protons Found Using Dispersion Relations and an Isobar Model
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for $p(\vec{e},e^{\prime }{\pi }^{+})n$ in the $\Delta (1232)$ Resonance Region
• Determination of quadrupole strengths in the gamma*p-->Delta(1232) transition at Q2= 0.20 (GeV/c)2
• Dual parametrization of GPDs versus the double distribution Ansatz
• Electroproduction of the N*(1535) resonance at large momentum transfer
• The role of $q\bar{q}$ components in the N(1440) resonance
• Electroproduction of p π^{+} π^{-} off protons at 0.2<Q^{2}<0.6 GeV^{2} and 1.3<W<1.57 GeV with CLAS
• Recoil Polarization Measurements for Neutral Pion Electroproduction at Q^2=1 (GeV/c)^2 Near the Delta Resonance
• Large-$N_c$ relations for the electromagnetic N to Delta(1232) transition
• A light-front description of electromagnetic form factors for $J\le 3/2$ hadrons
• First measurement of target and double spin asymmetries for polarized e- polarized p --> e p pi0 in the nucleon resonance region above the Delta(1232)

Cited by in corpus (163)

• Baryons as relativistic three-quark bound states
• Baryon spectroscopy
• Physics Opportunities with the 12 GeV Upgrade at Jefferson Lab
• Scattering processes and resonances from lattice QCD
• Explanation and Prediction of Observables using Continuum Strong QCD
• Progress Toward Understanding Baryon Resonances
• Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
• Electroexcitation of nucleon resonances
• 50 Years of Quantum Chromodynamics
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• A study of the $P_{11}(1440)$ and $D_{13}(1520)$ resonances from CLAS data on $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$
• Electromagnetic Excitation of Nucleon Resonances
• Nucleon and $\Delta$ elastic and transition form factors
• Nucleon and Roper electromagnetic elastic and transition form factors
• Completing the picture of the Roper resonance
• Dynamical coupled-channels model for neutrino-induced meson productions in resonance region
• 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
• Nucleon, $\Delta$ and $\Omega$ excited states in $N_f=2+1$ lattice QCD
• On light baryons and their excitations
• A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark Model
• Nucleon electromagnetic form factors and electroexcitation of low lying nucleon resonances in a light-front relativistic quark model
• Three Lectures on Hadron Physics
• Nucleon resonances in AdS/QCD
• Elastic and transition form factors of the Δ(1232)
• Nucleon Form Factors and Distribution Amplitudes in QCD
• Revealing dressed-quarks via the proton's charge distribution
• Valence quark contributions for the gamma N -> P11(1440) form factors
• Nucleon-to-Roper electromagnetic transition form factors at large-$Q^2$
• Measurements of $ep\to e^{\prime }{\pi }^{+}n$ at W = 1.6 - 2.0 GeV and extraction of nucleon resonance electrocouplings at CLAS
• Structure of the nucleon's low-lying excitations
• A covariant model for the gamma N -> N(1535) transition at high momentum transfer
• Precision measurements of $g_1$ of the proton and the deuteron with 6 GeV electrons
• Nucleon to Delta electromagnetic transition in the Dyson-Schwinger approach
• Timelike gamma* N -> Delta form factors and Delta Dalitz decay
• Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model
• Insights into the gamma* N -> Delta transition
• Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12
• A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition
• Measurement of the neutron charge radius and the role of its constituents
• Octet to decuplet electromagnetic transition in a relativistic quark model
• Dissecting nucleon transition electromagnetic form factors
• Excited Baryons in Holographic QCD
• Electroproduction of the $N^{\ast }(1535)$ nucleon resonance in QCD
• Measurements of $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$ Cross Sections with CLAS at $1.40<W<2.0$ GeV and $2.0<Q^2<5.0$ GeV${}^2$
• Electroproduction of the Roper resonance on the proton: the role of the three-quark core and the molecular N-sigma component
• Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles
• Relativistic corrections to decays of heavy baryons in the quark model
• Electromagnetic Transition Form Factors of Baryon Resonances
• Nucleon resonance contributions to unpolarised inclusive electron scattering
• Electromagnetic structure of nucleon and Roper in soft-wall AdS/QCD
• Transition form factors: ${\gamma }^{\ast }+p\to \Delta (1232)$, $\Delta (1600)$
• Dynamical diquarks in the ${\mathbf{\gamma }}^{(\ast )}\mathbf{p}\to \mathbf{N}(1535){\frac{1}{2}}^{-}$ transition
• Valence quark and meson cloud contributions for the gamma* Lambda -> Lambda* and gamma* Sigma0 -> Lambda* reactions
• Spectrum and structure of octet and decuplet baryons and their positive-parity excitations
• A simple relation between the gamma N -> N(1535) helicity amplitudes
• Results from the N* program at JLab
• Studies of N^* structure from the CLAS meson electroproduction data
• Valence quark and meson cloud contributions to the ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors
• Nucleon resonances in Compton scattering
• Photoproduction of pi0-mesons off neutrons in the nucleon resonance region
• Helicity Amplitudes of the Lambda(1670) and two Lambda(1405) as dynamically generated resonances
• $\Delta$(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES
• Electromagnetic transition form factors of baryons in the space-like momentum region
• ${\gamma }^{\ast }N\to N^{\ast }(1520)$ form factors in the timelike regime
• Electromagnetic transition form factors of the Roper resonance in effective field theory
• N* Structure and Strong QCD
• Nucleon resonances with higher spins in soft-wall AdS/QCD
• Effects of a spin-flavour dependent interaction on light-flavoured baryon helicity amplitudes
• Using the Single Quark Transition Model to predict nucleon resonance amplitudes
• Electromagnetic properties of the nucleon and the Roper resonance in soft-wall AdS/QCD at finite temperature
• Nucleon Resonance Structure from Exclusive Meson Electroproduction with CLAS
• Roper-like resonances with various flavor contents and their two-pion emission decays
• Electroexcitation of nucleon resonances of the [70,1-] multiplet in a light-front relativistic quark model
• A chiral quark model for meson electro-production in the region of D-wave resonances
• Semirelativistic approximation to the ${\gamma }^{\ast }N\to N(1520)$ and ${\gamma }^{\ast }N\to N(1535)$ transition form factors
• Valence quark contributions for the ${\gamma }^{\ast }N\to N(1440)$ form factors from Light-Front holography
• ${\gamma }^{\ast }N\to N(1710)$ transition at high momentum transfer
• Recent results on the nucleon resonance spectrum and structure from the CLAS detector
• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• Electroexcitation of the ${\Delta }^{+}(1232)$ at low momentum transfer
• The MAID Legacy and Future
• 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
• 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
• Improved empirical parametrizations of the ${\gamma }^{\ast }N\to \Delta (1232)$ and ${\gamma }^{\ast }N\to N(1520)$ helicity amplitudes and the Siegert's theorem
• Electromagnetic structure of the nucleon and the Roper resonance in a light-front quark approach
• Transition form factors and helicity amplitudes for electroexcitation of negative- and positive parity nucleon resonances in a light-front quark model
• Resonant contributions to inclusive nucleon structure functions from exclusive meson electroproduction data
• Electroexcitation of the Delta(1232)3/2+ and Delta(1600)3/2+ in a light-front relativistic quark model
• Extracting meson-baryon contributions to the electroexcitation of the $N(1675){\frac{5}{2}}^{-}$ nucleon resonance
• Exclusive ${\mathbf{\pi }}^0\mathbf{p}$ electroproduction off protons in the resonance region at photon virtualities 0.4~GeV${}^2$ $\le {\mathbf{Q}}^2\le 1$~GeV${}^2$
• N* Experiments and their Impact on Strong QCD Physics
• A chiral quark model for meson electro-production in the S11 partial wave
• Baryon transition form factors at the pole
• New low-$Q^2$ measurements of the ${\gamma }^{\ast }N\to \Delta (1232)$ Coulomb quadrupole form factor, pion cloud parametrizations and Siegert's theorem
• Covariant model for the Dalitz decay of the $N(1535)$ resonance
• Analytic parametrizations of the ${\gamma }^{\ast }N\to N(1440)$ form factors inspired by Light-Front holography
• Hadronic Form Factor Models and Spectroscopy Within the Gauge/Gravity Correspondence
• Impact of JLab data on the determination of GPDs at zero skewness and new insights from transition form factors $N\to \Delta$
• Virtual Compton Scattering measurements in the nucleon resonance region
• Generalized baryon form factors and proton structure functions in the Sakai-Sugimoto model
• 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
• Nucleon Resonance Physics
• Photoproduction of {\boldmath{${\pi }^0$}} Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region
• Baryons and the Borromeo
• Low-$Q^2$ empirical parametrizations of the $N^{\ast }$ helicity amplitudes
• Electroexcitation of nucleon resonances in a light-front relativistic quark model
• Production of negative parity baryons in the holographic Sakai-Sugimoto model
• Measurement of Target and Double-spin Asymmetries for the $\vec{e}\vec{p}\to e{\pi }^{+}(n)$ Reaction in the Nucleon Resonance Region at Low $Q^2$
• Nucleon to $\Delta$ transition form factors and empirical transverse charge densities
• Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^2>1$ GeV${}^2$. II. $ep\to e{\pi }^{0}p$
• Resonant contributions to polarized proton structure functions
• Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^2>1$ GeV${}^2$. I. $ep\to e{\pi }^{+}n$
• Single pion production in electron-proton interactions
• Updates on the Studies of $N^{\ast }$ Structure with CLAS and the Prospects with CLAS12
• Combined parametrization of the neutron electric form factor and the ${\gamma }^{\ast }N\to \Delta (1232)$ quadrupole form factors
• The Spectroscopy and Form Factors of Nucleon Resonances from Superconformal Quantum Mechanics and Holographic QCD
• Electromagnetic transition amplitude for Roper resonance from holographic QCD
• Global Data-Driven Determination of Baryon Transition Form Factors
• Magnetic field in relativistic heavy ion collisions: testing the classical approximation
• Exclusive and semiexclusive production of ${\mu }^{+}{\mu }^{-}$ pairs with $\Delta$ isobars and other resonances in the final state and the size of absorption effects
• Structure of the orbital excited $N^{\ast }$ from the Schwinger-Dyson equations
• Spectrum and Structure of Excited Baryons with CLAS
• Target and Beam-Target Spin Asymmetries in Exclusive ${\pi }^{+}$ and ${\pi }^{-}$ Electroproduction with 1.6 to 5.7 GeV Electrons
• Electromagnetic baryon form factors in the Poincare-covariant Faddeev approach
• Assessing the theory-data tension in neutrino-induced charged pion production: the effect of final-state nucleon distortion
• Light-Front Holography, Light-Front Wavefunctions, and Novel QCD Phenomena
• The decays ${\Lambda }_{b,c}\to N^{\ast }l\nu$ in QCD
• Study of excited nucleons and their structure
• Electromagnetic $N-\Delta (1232)$ transitions within the point-form of relativistic quantum mechanics
• Measurement of the Partial Cross Sections s(TT), s(LT) and [s(T)+epsilon*s(L)] of the p(e,e' pi+)n Reaction in the Delta(1232) Resonance
• Evaluation of the inclusive electron scattering observables in the resonance region from the experimental data
• Charged current (anti)neutrino induced eta production off the nucleon
• Low-Q^2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition
• Gauge- and point-invariant vertices of nucleon-to-resonance interactions
• Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors
• Meson Production and Baryon Resonances at CLAS
• Elastic and Transition Form Factors in DSEs
• ${\gamma }_{\mathbf{v}}\mathbf{N}{\mathbf{N}}^{\ast }$ Electrocouplings in Dyson-Schwinger Equations
• Constituent-quark model with pionic contributions: electromagnetic $N\to \Delta$ transition
• Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum
• Electromagnetic transition form factors of nucleons from the hard-wall AdS/QCD model
• Vertex operators for production of baryon resonances in nucleon-gamma collisions with preserving gauge invariance and analyticity
• Running Masses in the Nucleon and its Resonances
• Nucleon-to-Resonance Form Factors at Large Photon Virtualities
• Why is GeV physics relevant in the age of the LHC?
• A covariant model for the ${\gamma }^{\ast }N\to N^{\ast }(1520)$ reaction
• Pion electroproduction measurements in the nucleon resonance region
• Light-quark baryon spectroscopy from ANL-Osaka dynamical coupled-channels analysis
• Polarized proton structure in the resonance region
• Quark model calculations of transition form factors at high photon virtualities
• Systematic study of longitudinal and transverse helicity amplitudes in the hypercentral Constituent Quark Model
• Baryons with functional methods
• A covariant model for the negative parity resonances of the nucleon
• Axial-vector nucleon-to-delta transition form factors using the complex-mass renormalization scheme
• Study of $N(1440)$ structure via ${\gamma }^{\ast }p\to N(1440)$ transition
• Light-cone sum rule approach for Baryon form factors
• Flavour decomposition of electromagnetic transition form factors of nucleon resonances
• A Relativistic Model for the Electromagnetic Structure of Baryons from the 3rd Resonance Region
• Helicity amplitudes of $N(1520)$ and $N(1535)$ including pentaquark components
• About the magnitude of the ${\gamma }^{\ast }N\to N(1520)$ transverse amplitudes near $Q^2=0$
• Valence-quark structure N* resonances from DSEs