Baryon Current Matrix Elements in a Light-Front Framework

Abstract

Current matrix elements and observables for electro- and photo-excitation of baryons from the nucleon are studied in a light-front framework. Relativistic effects are estimated by comparison to a nonrelativistic model, where we use simple basis states to represent the baryon wavefunctions. Sizeable relativistic effects are found for certain transitions, for example, to radial excitations such as that conventionally used to describe to the Roper resonance. A systematic study shows that the violation of rotational covariance of the baryon transition matrix elements stemming from the use of one-body currents is generally small.

32 pages, LaTeX, 10 postscript figures, uses epsf.sty; figures uuencoded with uufiles (or available by request in .ps or hardcopy form)

Cited by in corpus (120)

• Baryons as relativistic three-quark bound states
• Baryon spectroscopy
• Physics Opportunities with the 12 GeV Upgrade at Jefferson Lab
• Explicitly Covariant Light-Front Dynamics and Relativistic Few-Body Systems
• Meson-exchange Model for $\pi N$ scattering and $\gamma N->\pi N$ reaction
• Progress Toward Understanding Baryon Resonances
• Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction
• What is the structure of the Roper resonance?
• Studies of Nucleon Resonance Structure in Exclusive Meson Electroproduction
• Electroexcitation of nucleon resonances
• Electroproduction of the Delta Resonance at High Momentum Transfer
• Study of Non-Strange Baryon Resonances with Meson Photoproduction
• Baryon Resonance Extraction from piN Data using a Unitary Multichannel Model
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• 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
• A study of the $P_{11}(1440)$ and $D_{13}(1520)$ resonances from CLAS data on $ep\to e^{\prime }{\pi }^{+}{\pi }^{-}{p}^{\prime }$
• Search for Quadrupole Strength in the Electro-excitation of the Delta(1232)
• The Role of Color Neutrality in Nuclear Physics--Modifications of Nucleonic Wave Functions
• The e p -> e' p eta reaction at and above the S11(1535) baryon resonance
• Semileptonic Decays of Heavy Lambda Baryons in a Quark Model
• Electromagnetic transition form factors of negative parity nucleon resonances
• Chiral Effective-Field Theory in the Delta(1232) Region: Pion Electroproduction on the Nucleon
• 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
• Electromagnetic Form Factors of the Nucleon in an Improved Quark Model
• $Q^2$ Independence of $Q{F}_2/F_1$, Poincare Invariance and the Non-Conservation of Helicity
• Electroexcitation of the P33(1232), P11(1440), D13(1520), S11(1535) at Q^2=0.4 and 0.65(GeV/c)^2
• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• SU(6) breaking effects in the nucleon elastic electromagnetic form factors
• Electroexcitation of the Roper resonance for 1.7 < Q2 < 4.5 GeV2 in ep -> enpi+
• Pair term in the Electromagnetic Current within the Front-Form Dynamics: Spin-0 Case
• Nucleon electromagnetic form factors and electroexcitation of low lying nucleon resonances in a light-front relativistic quark model
• A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark Model
• Baryon Form Factors of Relativistic Constituent-Quark Models
• D-state effects in the electromagnetic N-Delta transition
• A Covariant model for the nucleon and the $\Delta$
• 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
• Nucleon resonances in AdS/QCD
• A consistent explanation of the Roper phenomenology
• Electromagnetic Form Factors in a Collective Model of the Nucleon
• Valence quark contribution for the gamma N -> Delta quadrupole transition extracted from lattice QCD
• Valence quark contributions for the gamma N -> P11(1440) form factors
• Transition form factors of the N*(1535) as a dynamically generated resonance
• Covariant quark model of form factors in the heavy mass limit
• Electromagnetic Form Factors of Nucleons in a Light-cone Diquark Model
• Electroproduction of the Roper resonance and the constituent quark model
• A covariant model for the gamma N -> N(1535) transition at high momentum transfer
• Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model
• Hadron structure at low Q^2
• Electroproduction of Eta Mesons in the S11(1535) Resonance Region at High Momentum Transfer
• Electromagnetic Properties for Arbitrary Spin Particles: Part 2 $-$ Natural Moments and Transverse Charge Densities
• A model for the Delta(1600) resonance and gamma N -> Delta(1600) transition
• The role of the pion cloud in electroproduction of the $\Delta$(1232)
• Octet to decuplet electromagnetic transition in a relativistic quark model
• Electromagnetic and weak current operators for interacting systems within the front-form dynamics
• 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
• Electroproduction of the Roper resonance on the proton: the role of the three-quark core and the molecular N-sigma component
• Helicity amplitudes and electromagnetic decays of hyperon resonances
• Electromagnetic $N-\Delta$ transition form factors in a light-front constituent quark model
• Relativistic corrections to decays of heavy baryons in the quark model
• Electromagnetic Transition Form Factors of Baryon Resonances
• Angular Conditions,Relations between Breit and Light-Front Frames, and Subleading Power Corrections
• Electromagnetic structure of nucleon and Roper in soft-wall AdS/QCD
• Transition form factors: ${\gamma }^{\ast }+p\to \Delta (1232)$, $\Delta (1600)$
• 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
• Study of polarized-e polarized-p --> e-prime p pi0 in the Delta(1232) mass region using polarization asymmetries
• Measurement of the Polarized Structure Function ${\sigma }_{L{T}^{\prime }}$ for Pion Electroproduction in the Roper Resonance Region
• Nucleon resonances with higher spins in soft-wall AdS/QCD
• Using the Single Quark Transition Model to predict nucleon resonance amplitudes
• Effects of a spin-flavour dependent interaction on light-flavoured baryon helicity amplitudes
• Electroexcitation of nucleon resonances of the [70,1-] multiplet in a light-front relativistic quark model
• Extraction of the Ratio of the N^*(1535) Electromagnetic Helicity Amplitudes from Eta Photoproduction off Neutrons and Protons
• Semirelativistic approximation to the ${\gamma }^{\ast }N\to N(1520)$ and ${\gamma }^{\ast }N\to N(1535)$ transition form factors
• ${\gamma }^{\ast }N\to N(1710)$ transition at high momentum transfer
• A chiral quark model for meson electro-production in the region of D-wave resonances
• Study of nucleon resonances with electromagnetic interactions
• Transition form factors and helicity amplitudes for electroexcitation of negative- and positive parity nucleon resonances in a light-front quark model
• Electromagnetic structure of the nucleon and the Roper resonance in a light-front quark approach
• On the deuteron relativistic charge distributions
• Electroexcitation of the Delta(1232)3/2+ and Delta(1600)3/2+ in a light-front relativistic quark model
• Model-Independent Extraction of the N*(1535) Electrostrong Form Factor from Eta Electroproduction
• Electromagnetic Form Factors in the hypercentral CQM
• N^* electroproduction amplitudes in a model with dynamical confinement
• Axial amplitudes for Delta excitation in chiral quark models
• The Roper resonance: a genuine quark state or a dynamically generated structure?
• $\Delta$(1232) electroproduction amplitudes in chiral soliton models of the nucleon
• Electroexcitation of nucleon resonances in a light-front relativistic quark model
• Scaling law for the electromagnetic form factors of the proton
• A Study of the Roper Resonance as a Hybrid State from $J/\psi$ Decays
• Incoherent Photoproduction of $\eta$-mesons from the Deuteron near Threshold
• Photo-absorption on deuteron contributed by d^*(2380) resonance
• Photocouplings of nucleon resonances with gluon and pion exchange currents
• Electromagnetic transition amplitude for Roper resonance from holographic QCD
• Delta isobar masses, large N_c relations, and the quark model
• Nucleon form factors in a chiral constituent-quark model
• Electromagnetic transitions of excited baryons in a deformed oscillator quark model
• Zero Modes in Electromagnetic Form Factors of the Nucleon in a Light-Cone Diquark Model
• Threshold eta and eta' electroproduction off nucleons
• Dependence of Electromagnetic Form Factors of Hadrons on Light Cone Frames
• The nucleon Drell-Hearn-Gerasimov sum rule within a relativistic constituent quark model
• Nucleon magnetic moments in an extended chiral constituent quark model
• Dynamical generation of resonances in the P33 partial wave
• Recent results on nucleon resonance electrocouplings from the studies of ${\pi }^{+}{\pi }^{-}p$ electroproduction with the CLAS detector
• Highlights of Recent Results with Clas
• The N* Physics Program at Jefferson Lab
• Violations of Lorentz Covariance in Light Front Quark Models
• Meson Production and Baryon Resonances at CLAS
• Radiative decay into gamma-baryon of dynamically generated resonances from the vector-baryon interaction
• ${\gamma }^{\ast }N\to {\Delta }^{+}(1600)$ transition form factors in light-cone sum rules
• Electromagnetic Form Factors of the Nucleon in a Relativistic Quark Pair Creation Model
• Odd-Parity Nucleon Electromagnetic Transitions in Lattice QCD
• Nucleon-to-Resonance Form Factors at Large Photon Virtualities
• Relativistic few-body physics
• Helicity amplitudes of $N(1520)$ and $N(1535)$ including pentaquark components
• Dynamical coupled-channels: the key to understanding resonances
• Light-cone sum rules for radial excitation of decuplet to octet baryons electromagnetic transition form factors