Determination of the neutron electric form factor from the reaction 3 He(e,e'n) at medium momentum transfer

Becker, Jan; Andresen, H. G.; Annand, J. R. M.; Aulenbacher, K.; Beuchel, K.; Blume–Werry, J.; Dombo, Th.; Drescher, P.; Ebert, M.; Eyl, D.; Frey, A.; Grabmayr, P.; Großmann, T.; Hartmann, Péter; Hehl, T.; Heil, W.; Herberg, C.; Hoffmann, J.; Kellie, J. D.; Klein, F.; Livingston, K.; Leduc, Michèle; Meyerhoff, M.; Möller, Hans; Nachtigall, Ch.; Natter, A.; Ostrick, M.; Otten, E.; Owens, R.O.; Plützer, S.; Reichert, E.; Rohe, D.; Schäfer, Markus; Schmieden, H.; Sprengard, R.; Steigerwald, Michael L.; Steffens, K.; Surkau, R.; Walcher, Th.; Watson, R.; Wilms, Eivor

doi:10.1007/s100500050351

Cited by 129 publications

(77 citation statements)

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“…Starting in the early 1990's, the neutron electric FF G En has been obtained in several experiments at MAMI, by measuring the beam-target asymmetry in the exclusive quasi-elastic scattering of electrons from polarized 3 He in the 3 He( e, e ′ n)pp reaction [Mey94,Bec99,Roh99,Ber03]. All the G En data from polarization experiments are shown in Fig.…”

Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

“…In following experiments at MAMI, G En was extracted at Q 2 of 0.35 GeV 2 [Bec99] and 0.67 GeV 2 [Roh99, Ber03] using the same reaction. The 0.35 GeV 2 point of [Bec99] was later corrected in [Gol01], based on Faddeev solutions and with some MEC corrections. The large effect of these corrections is illustrated in Fig.…”

Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

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Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

474

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: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

Section: Neutron Electric Form Factor Measurements With Polarization mentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

474

583

View full text Add to dashboard Cite

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“…The experimental data for G p E , G n E , G p M , and G n M are taken from Refs. [39,40,41,42], [43,44,45,46,47], [40,41,48,49], and [50,51,52,53,54,55], respectively. .…”

Section: Appendix B: Contributions To the Dirac And Pauli Form Fac-torsmentioning

confidence: 99%

Electromagnetic form factors of the nucleon in chiral perturbation theory

Fuchs¹,

Gegelia²,

Scherer³

2004

J. Phys. G: Nucl. Part. Phys.

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The electromagnetic form factors of the nucleon are calculated at order q 4 in the relativistic formulation of baryon chiral perturbation theory. In order to obtain a consistent power counting for the renormalized diagrams we make use of the extended on-mass-shell renormalization scheme which we have discussed in a recent paper. We analyze the Dirac and Pauli form factors, F 1 and F 2 , as well as the electric and magnetic Sachs form factors, G E and G M . Our results are compared with those obtained in the heavy-baryon approach and in the (relativistic) infrared regularization. In addition, the Sachs form factors are compared with experimental data. We confirm previous findings that a one-loop calculation of the electromagnetic form factors does not generate sufficient curvature for the Sachs form factors G p E , G p M , and G n M . Moreover, the electric form factor of the neutron is very sensitive to higher-order contributions.

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“…In general, our new datum at Q 2 = 0.447 (GeV/c) 2 agrees well with the existing low Q 2 data, and our new datum at We fitted all of these data and the slope of GEn at the origin [142,144] [as measured via e(n, n') scattering; recall the discussion in Section 2. [195,[202][203][204][205]207,209,210,213,214,218]. The black dashed curve is the original Galster parameterization, and the blue solid curve is the result of our modified Galster parameterization fit to these data.…”

Section: Current World Data On Genmentioning

confidence: 99%

“…The data shown for ppGEp/GMp are from [212,[215][216][217], and those for pInGEn/GM are from [202][203][204][205]207,209,210,213,214,218]. All published polarized results for the nucleon form factors are now presented here.…”

Section: Factors With Theoretical Calculationsmentioning

confidence: 99%

The neutron electric form factor to Q² = 1.45 (GeV/c)²

Plaster¹

2004

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The nucleon elastic electromagnetic form factors are fundamental quantities needed for an understanding of nucleon and nuclear electromagnetic structure. The evolution of the Sachs electric and magnetic form factors with Q 2 , the square of the fourmomentum transfer, is related to the distribution of charge and magnetization within the nucleon. High precision measurements of the nucleon form factors are essential for stringent tests of our current theoretical understanding of confinement within the nucleon.Measurements of the neutron form factors, in particular, those of the neutron electric form factor, have been notoriously difficult due to the lack of a free neutron target and the vanishing integral charge of the neutron. Indeed, a precise measurement of the neutron electric form factor has eluded experimentalists for decades; however, with the advent of high duty-factor polarized electron beam facilities, experiments employing polarization degrees of freedom have finally yielded the first precise measurements of this fundamental quantity.Following a general overview of the experimental and theoretical status of the nucleon form factors, a detailed description of an experiment designed to extract the neutron electric form factor from measurements of the neutron's recoil polarization in quasielastic 2 H(e, e')lH scattering is presented. The experiment described here employed the Thomas Jefferson National Accelerator Facility's longitudinally polarized electron beam, a magnetic spectrometer for detection of the scattered electron, and a neutron polarimeter designed specifically for this experiment. Measurements were conducted at three Q 2 values of 0.45, 1.13, and 1.45 (GeV/c) 2 , and the final results extracted from an analysis of the data acquired in this experiment are reported and compared with recent theoretical predictions for the nucleon form factors. Next, I would like to thank those who I credit most for my development: Jim Kelly and Andrei Semenov. At times, I found Jim's extremely high standards and desire for rigor to be exasperating, especially during the development of our simulation code and discussions of formalism (e.g., the "dreaded" Wigner rotation!), but, in retrospect, I am glad that I was constantly challenged to do something in an even better way and never permitted to give up. Indeed, I didn't fully appreciate the rigor of our analysis until our results were final, but hindsight is always 20/20. Also, I thank Jim for numerous comments and suggestions on this thesis; it is much better and much more complete because of his many suggestions. Andrei was the true guru (read: czar) of our analysis efforts, and he instilled in me the importance of careful work.I especially appreciate Andrei's timely responses to the numerous questions I always had concerning the analysis and the various analysis tools that we used; if there was someone who was sure to know the answer, that person was Andrei. Without Andrei, our analysis efforts would never have gotten off the ground. I also offer thank...

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Determination of the neutron electric form factor from the reaction 3 He(e,e'n) at medium momentum transfer

Cited by 129 publications

References 0 publications

Nucleon electromagnetic form factors

Nucleon electromagnetic form factors

Electromagnetic form factors of the nucleon in chiral perturbation theory

The neutron electric form factor to Q² = 1.45 (GeV/c)²

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