Nucleon form factors from generalized parton distributions

Guidal, M.; Polyakov, Maxim V.; Radyushkin, Anatoly; Vanderhaeghen, Marc

doi:10.1103/physrevd.72.054013

Cited by 331 publications

(485 citation statements)

References 73 publications

Supporting

Mentioning

455

Contrasting

Order By: Relevance

“…This method requires the measurement of an asymmetry. For our experiment, polarized 3 He is a suitable stand-in for a neutron target, as described in Chapter 4, specifically Sec. 4.1.…”

Section: Double Polarized Methodsmentioning

confidence: 99%

“…The combination of a high pressure (10 atm), highly polarized (50%) 3 He target and a large acceptance, open geometry spectrometer, BigBite, provides a better combination of statistical and systematic uncertainty than previous double-polarized G n E experiments [5]. BigBite is a non-focusing dipole magnet with an acceptance of 76 msr over a 40 cm target.…”

Section: Experimental Overviewmentioning

confidence: 99%

“…They are generalizations of the parton distribution functions derived from deep inelastic scattering. They are constrained by the electromagnetic form factors [2,3].…”

Section: Generalized Parton Distributionsmentioning

confidence: 99%

“…The GPDs H, E,H, andẼ depend on the following variables: x, the fraction of the nucleon momentum carried by the struck quark; ξ, the skewness, or longitudinal momen- Milbrath [47] Punjabi [48] Dieterich [49] Gayou [32] Arrington [50] Christy [51] Qattan [52] Lomon --VMD [33] Miller --CQM [34] [ tum asymmetry; and t the momentum transfer to the target nucleon [3]. Unlike the other models of the nucleon listed here, GPDs are not currently used to calculate form factors.…”

Section: Generalized Parton Distributionsmentioning

confidence: 99%

See 3 more Smart Citations

A Measurement of the neutron electric form factor at very large momentum transfer using polaried electrions scattering from a polarized helium-3 target

Kelleher

2010

View full text Add to dashboard Cite

Knowledge of the electric and magnetic elastic form factors of the nucleon is essential for an understanding of nucleon structure. Of the form factors, the electric form factor of the neutron has been measured over the smallest range in Q 2 and with the lowest precision. Jefferson Lab experiment 02-013 used a novel new polarized 3 He target to nearly double the range of momentum transfer in which the neutron form factor has been studied and to measure it with much higher precision. Polarized electrons were scattered off this target, and both the scattered electron and neutron were detected. G n E was measured to be 0.0242 ± 0.0020(stat) ± 0.0061(sys) and 0.0247 ± 0.0029(stat) ± 0.0031(sys) at Q 2 = 1.7 and 2.5 GeV 2 , respectively.

show abstract

“…This method requires the measurement of an asymmetry. For our experiment, polarized 3 He is a suitable stand-in for a neutron target, as described in Chapter 4, specifically Sec. 4.1.…”

Section: Double Polarized Methodsmentioning

confidence: 99%

Section: Experimental Overviewmentioning

confidence: 99%

“…They are generalizations of the parton distribution functions derived from deep inelastic scattering. They are constrained by the electromagnetic form factors [2,3].…”

Section: Generalized Parton Distributionsmentioning

confidence: 99%

Section: Generalized Parton Distributionsmentioning

confidence: 99%

See 2 more Smart Citations

A Measurement of the neutron electric form factor at very large momentum transfer using polaried electrions scattering from a polarized helium-3 target

Kelleher

2010

View full text Add to dashboard Cite

show abstract

“…[3,[7][8][9][10][11] and references therein). Vector-meson-production amplitudes contain various linear combinations of GPDs for quarks of various flavors and for gluons.…”

Section: Introductionmentioning

confidence: 99%

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

et al. 2017

View full text Add to dashboard Cite

Exclusive ρ 0 -meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV 2 < Q 2 < 7.0 GeV 2 , 3.0 GeV < W < 6.3 GeV, and −t < 0.4 GeV 2 . Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing ρ 0 -meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude F 0 1 2 0 1 2 , which describes the production of a longitudinal ρ 0 -meson by a longitudinal virtual photon. The ratios of nucleon-helicity-nonflip amplitudes are found to be in good agreement with those from the previous HERMES analysis. The transverse target polarization allows for the first time the extraction of ratios of a number of nucleon-helicity-flip amplitudes to F 0 1 2 0 1 2 . Results obtained in a handbag approach based on generalized parton distributions taking into account the contribution from pion exchange are found to be in good agreement with these ratios. Within the model, the data favor a positive sign for the π − ρ transition form factor. By also exploiting the longitudinal beam polarization, a total of 71 ρ 0 spin-density matrix elements is determined from the extracted 25 parameters, in contrast to only 53 elements as directly determined in earlier analyses.

show abstract

QCD sum rules and models for generalized parton distributions

Radyushkin

2004

Ann. Phys.

View full text Add to dashboard Cite

Dedicated to Klaus Goeke on occasion of his 60th birthdayI use QCD sum rule ideas to construct models for generalized parton distributions. To this end, the perturbative parts of QCD sum rules for the pion and nucleon electromagnetic form factors are interpreted in terms of GPDs and two models are discussed. One of them takes the double Borel transform at adjusted value of the Borel parameter as a model for nonforward parton densities, and another is based on the local duality relation. Possible ways of improving these Ansätze are briefly discussed.

show abstract

Nucleon form factors from generalized parton distributions

Cited by 331 publications

References 73 publications

A Measurement of the neutron electric form factor at very large momentum transfer using polaried electrions scattering from a polarized helium-3 target

A Measurement of the neutron electric form factor at very large momentum transfer using polaried electrions scattering from a polarized helium-3 target

Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

QCD sum rules and models for generalized parton distributions

Contact Info

Product

Resources

About