Electromagnetic Form Factors of the Nucleon

Ernst, Frederick J.; Sachs, Robert G.; Wali, Kameshwar C.

doi:10.1103/physrev.119.1105

Cited by 271 publications

(205 citation statements)

References 15 publications

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“…Another set of nucleon FFs, F ch and F mag , was first introduced by Yennie, Levy and Ravenhall [Yen57]; Ernst, Sachs and Wali [Ern60] connected F ch and F mag to the charge and current distributions in the nucleon; the interpretation that F ch and F mag measure the interaction with static charge and magnetic fields was given by Walecka [Wal59]. The following FFs, F ch and F mag , were defined in [Ern60]:…”

Section: The Electric and Magnetic Form Factorsmentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

475

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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Section: The Electric and Magnetic Form Factorsmentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

475

583

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“…where q 2 = (p − p) 2 = t and N stands for p or n. The Sachs electric and magnetic form factors are related to the Dirac-Pauli basis by [91] G…”

Section: Form Factor Definitionsmentioning

confidence: 99%

Model independent extraction of the proton magnetic radius from electron scattering

2014

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We combine constraints from analyticity with experimental electron-proton scattering data to determine the proton magnetic radius without model-dependent assumptions on the shape of the form factor. We also study the impact of including electron-neutron scattering data, and ππ → NN data. Using representative datasets we find for a cut of Q 2 ≤ 0.5 GeV 2 , r p M = 0.91 +0.03 −0.06 ± 0.02 fm using just proton scattering data; r p M = 0.87 +0.04 −0.05 ± 0.01 fm adding neutron data; and r p M = 0.87 +0.02 −0.02 fm adding ππ data. We also extract the neutron magnetic radius from these data sets obtaining r n M = 0.89 +0.03 −0.03 fm from the combined proton, neutron, and ππ data.

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“…This brings up the question, Can we impose on the gauge invariant N∆(1232)-vertex such additional symmetry conditions that will postulate it uniquely, give us a set of the FFs satisfying the requirements in the domain of high-Q 2 , and do not contradict the experimental data? We should also note that there is an example of such a theorythe elastic γ * NN-vertex [23,24] is determined uniquely by the electromagnetic gauge symmetry 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the physical meaning of the FFs can depend upon the definition of the vertex, since different relations (1), if resolved in respect to F f (Q 2 ), may result in different regimes of the Q 2 -evolution of the FFs. It is important to note the following property of the relations between the elastic Sachs helicity FFs G M, E (Q 2 ) and the Dirac and Pauli FFs F D, P (Q 2 ) [23,24]. At asymptotically high Q 2 the magnetic FF scales like the Dirac one, G M (Q 2 ) ∼ F D (Q 2 ), and the electric FF scales like the Pauli one, G E (Q 2 ) ∼ Q 2 F P (Q 2 ) [20].…”

Section: Introductionmentioning

confidence: 99%

Low-Q2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition

Vereshkov

Volchanskiy

2010

Physics Letters B

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We address the issue of the scaling behavior of the nucleon electromagnetic form factors (FFs). We propose a consistent Lagrangian of the electromagnetic N∆ (1232)-interaction possessing all the internal symmetries of the spin-3 2 baryon resonance, point and gauge invariance. The point and gauge invariant FFs may exhibit quasi-scaling behavior-while the FFs do not reach asymptotic scaling domain, the ratios thereof do. The hypothesis of the quasi-scaling is in good agreement with the experimental data available at Q 2 0.4 GeV 2 .

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Electromagnetic Form Factors of the Nucleon

Cited by 271 publications

References 15 publications

Nucleon electromagnetic form factors

Nucleon electromagnetic form factors

Model independent extraction of the proton magnetic radius from electron scattering

Low-Q2 scaling behavior of the form-factor ratios for the NΔ(1232)-transition

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