Erratum: Baryon form factors of relativistic constituent-quark models [Phys. Rev. C<b>69</b>, 035212 (2004)]

Juliá-Dı́az, B.; Riska, D.O.; Coester, F.

doi:10.1103/physrevc.75.069902

Cited by 57 publications

(140 citation statements)

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“…Figure 10 shows the long-standing discrepancy between the measured G * M (Q 2 ) and the constituent quark model predictions; here they are in comparison with the LF relativistic quark model of Ref. [18]. Within dynamical reaction models [25][26][27][28], the meson-cloud contribution was identified as the source of this discrepancy.…”

Section: A (1232) P 33 Resonancementioning

confidence: 99%

“…The dotted curve for G * M is the prediction of a LF relativistic quark model of Ref. [18]; the dotted curves for R EM , R SM are the MAID2007 solutions [39].…”

Section: B N(1440) P 11 Resonancementioning

confidence: 99%

“…A consistent way to perform the relativistic treatment of the γ * N → N (N * ) transitions is to consider them in the light-front (LF) dynamics [9][10][11]. The relevant approaches were developed and used to describe the nucleon and its excited states [12][13][14][15][16][17][18][19]. However, much more effort is required to obtain a better understanding of what are the N and N * LF wave functions and what is their connection to the interquark forces and to the QCD confining mechanism.…”

Section: Introductionmentioning

confidence: 99%

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Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Aznauryan¹,

Burkert²,

Biselli³

et al. 2009

Phys. Rev. C

250

380

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We present results on the electroexcitation of the low mass resonances (1232)P 33 , N (1440)P 11 , N (1520)D 13 , and N (1535)S 11 in a wide range of Q 2 . The results were obtained in the comprehensive analysis of data from the Continuous Electron Beam Accelerator Facility (CEBAF) large acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility (JLab) on differential cross sections, longitudinally polarized beam asymmetries, and longitudinal target and beam-target asymmetries for π electroproduction off the proton. The data were analyzed 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 (1232)P 33 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 Q 2 6 GeV 2 . For the Roper resonance, N (1440)P 11 , the data provide strong evidence that this state is a predominantly radial excitation of a three-quark (3q) ground state. Measured in pion electroproduction, the transverse helicity amplitude for the N (1535)S 11 allowed us to obtain the branching ratios of this state to the πN and ηN channels via comparison with the results extracted from η electroproduction. The extensive CLAS data also enabled the extraction of the γ * p → N (1520)D 13 and N (1535)S 11 longitudinal helicity amplitudes with good precision. For the N (1535)S 11 , these results became a challenge for quark models and may be indicative of large meson-cloud contributions or of representations of this state that differ from a 3q excitation. The transverse amplitudes for the N (1520)D 13 clearly show the rapid changeover from helicity-3/2 dominance at the real photon point to helicity-1/2 dominance at Q 2 > 1 GeV 2 , confirming a long-standing prediction of the constituent quark model.

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Section: A (1232) P 33 Resonancementioning

confidence: 99%

“…The dotted curve for G * M is the prediction of a LF relativistic quark model of Ref. [18]; the dotted curves for R EM , R SM are the MAID2007 solutions [39].…”

Section: B N(1440) P 11 Resonancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Aznauryan¹,

Burkert²,

Biselli³

et al. 2009

Phys. Rev. C

250

380

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show abstract

“…The power is determined by the current operator and is independent of the WF. An explicit comparative calculation of the baryon e.m. FFs between the three different forms was performed in [Jul04] using a simple algebraic form for the three-quark WF, depending on two parameters. It was verified that a qualitative description of the nucleon FF data demands a spatially extended WF in the instant-and front-form descriptions, in contrast to the point-form description which demands a much more compact WF.…”

Section: Constituent Quark Modelsmentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

470

583

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There has been much activity in the measurement of the elastic electromagnetic proton and neutron form factors in the last decade, and the quality of the data has been greatly improved by performing double polarization experiments, in comparison with previous unpolarized data. Here we review the experimental data base in view of the new results for the proton, and neutron, obtained at MIT-Bates, MAMI, and JLab. The rapid evolution of phenomenological models triggered by these high-precision experiments will be discussed, including the recent progress in the determination of the valence quark generalized parton distributions of the nucleon, as well as the steady rate of improvements made in the lattice QCD calculations.

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“…Along with the hadron masses and their partial decay widths, the information on the γ v pN * electrocouplings played an important role in the development of the quark models in their contemporary advanced relativistic version in light-front dynamics [8][9][10][11][12][13][14]. The picture of the nucleon and its excited states, which seemed quite simply modeled with three relativistic constituent quarks, turned out to be more complex.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of theP11(1440)andD13(1520)
Mokeev¹,
Burkert²,
Elouadrhiri³
et al. 2012
Phys. Rev. C
131
3
168
0
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A study of the P 11 (1440) The transition helicity amplitudes from the proton ground state to the P11(1440) and D13(1520) excited states (γvpN * electrocouplings) were determined from the analysis of nine independent onefold differential π + π − p electroproduction cross sections off a proton target, taken with CLAS at photon virtualities 0.25 GeV 2 < Q 2 < 0.60 GeV 2 . The phenomenological reaction model was employed for separation of the resonant and non-resonant contributions to the final state. The P11(1440) and D13(1520) electrocouplings were obtained from the resonant amplitudes parametrized within the framework of a unitarized Breit-Wigner ansatz. They are consistent with results obtained in the previous CLAS analyses of the π + n and π 0 p channels. The successful description of a large body of data in dominant meson-electroproduction channels off protons with the same γvpN * electrocouplings offers clear evidence for the reliable extraction of these fundamental quantities from meson-electroproduction data. This analysis also led to the determination of the long-awaited hadronic branching ratios for the D13(1520) decay into ∆π (24%-32%) and N ρ (8%-17%).

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Erratum: Baryon form factors of relativistic constituent-quark models [Phys. Rev. C69, 035212 (2004)]

Cited by 57 publications

References 0 publications

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Nucleon electromagnetic form factors

Experimental study of theP11(1440)andD13(1520)
Mokeev¹,
Burkert²,
Elouadrhiri³
et al. 2012
Phys. Rev. C
131
3
168
0
View full text Add to dashboard Cite

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Erratum: Baryon form factors of relativistic constituent-quark models [Phys. Rev. C69, 035212 (2004)]

Cited by 57 publications

References 0 publications

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Electroexcitation of nucleon resonances from CLAS data on single pion electroproduction

Nucleon electromagnetic form factors

Experimental study of theP11(1440)andD13(1520)Mokeev1, Burkert2, Elouadrhiri3 et al. 2012Phys. Rev. C13131680View full textAdd to dashboardCite

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Experimental study of theP11(1440)andD13(1520)
Mokeev¹,
Burkert²,
Elouadrhiri³
et al. 2012
Phys. Rev. C
131
3
168
0
View full text Add to dashboard Cite