Electromagnetic Structure of the Proton and Neutron

Hofstadter, R.; Bumiller, F.; Yearian, M. R.

doi:10.1103/revmodphys.30.482

Cited by 204 publications

(74 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In such fit, two solutions appear also for G m , related to the choice of the other two FFs. 1 The value for Gq corresponding to Q = 2.788 fm −1 should be 2.59 +0.07 −0.71 , instead of 2.59(±0.073) [20] …”

Section: Resultsmentioning

confidence: 99%

“…Since the pioneering work of Hofstadter [1], a large number of experimental data have been collected about hadron electromagnetic FFs, especially in the space-like region. It is important to note that a relatively simple phenomenological parametrizations can be found for the description of the Q 2 dependence of different FFs, despite the possible complicated dynamics which determines the hadronic electromagnetic structure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two-component model for the deuteron electromagnetic structure

2006

View full text Add to dashboard Cite

We suggest a simple phenomenological parametrization for all three deuteron electromagnetic form factors, and show that a good fit on the available data, with a minimal number of parameters, can be obtained. The present description of the deuteron electromagnetic structure is based on two components with different radii, one corresponding to two nucleons separated by ≃2 fm, and a standard isoscalar contribution, saturated by ω and φ mesons, only.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-component model for the deuteron electromagnetic structure

2006

View full text Add to dashboard Cite

show abstract

“…These FFs were then introduced in experimental papers by Hofstadter and coworkers [Hof56,McA56,Hof58], who generalized the "effective" charge and magnetic moment concepts by associating the first with the deviation from a point charge Dirac particle (Dirac FF, F 1 ), and the second with the deviation from a point anomalous magnetic moment (Pauli FF, F 2 ).…”

Section: The Dirac and Pauli Nucleon Form Factorsmentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

475

583

View full text Add to dashboard Cite

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.

show abstract

“…Experiments aimed at studying the proton form factors (FFs), the electric (G E ) and magnetic (G M ) ones, which are frequently referred to as the Sachs FFs, have been performed since the mid 1950 s [1,2] by using elastic electron-proton scattering. In the case of unpolarized electrons and protons, all experimental data on the behavior of the proton FFs were obtained by using the Rosenbluth formula [1] for the differential cross section for the reaction ep → ep; that is, dσ dΩ e = α 2 E 2 cos 2 (θ e /2) 4E 3 1 sin 4 (θ e /2)…”

Section: Introductionmentioning

confidence: 99%

Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio

Galynskii

Kuraev

2014

Phys. Rev. D

View full text Add to dashboard Cite

Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio In the one-photon exchange approximation we discuss questions related to the interpretation of unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio GE/GM in the region 1.0 ≤ Q 2 ≤ 8.5 GeV 2 . For this purpose, we developed an approach which essentially is a generalization of the constituent-counting rules of the perturbative QCD (pQCD) for the case of massive quarks. We assume that at the lower boundary of the considered region the hard-scattering mechanism of pQCD is realized. Within the framework of the developed approach we calculated the hard kernel of the proton current matrix elements J ). This allows us to state that (i) around the lower boundary of the considered region, the leading scaling behavior of the Sachs form factors has the form GE, GM ∼ 1/Q 6 , (ii) the dipole dependence (GE, GM ∼ 1/Q 4 ) is realized in the asymptotic regime of pQCD when τ ≫ 1 (τ = Q 2 /4M 2 ) in the case when the quark transitions with spin-flip dominate, (iii) the asymptotic regime of pQCD in the JLab experiments has not yet been achieved, and (iv) the linear decrease of the ratio GE/GM at τ < 1 is due to additional contributions to J δ,δ p by spin-flip transitions of two quarks and an additional contribution to J −δ,δ p by spin-flip transitions of three quarks.

show abstract

Electromagnetic Structure of the Proton and Neutron

Cited by 204 publications

References 28 publications

Two-component model for the deuteron electromagnetic structure

Two-component model for the deuteron electromagnetic structure

Nucleon electromagnetic form factors

Alternative way to understand the unexpected results of the JLab polarization experiments to measure the Sachs form factors ratio

Contact Info

Product

Resources

About