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Plaster, B.; Semenov, A. Yu.; Aghalaryan, A.; Crouse, E.; MacLachlan, G. A.; Tajima, S.; Tireman, W.; Ahmidouch, A.; Anderson, B. D.; Arenhövel, H.; Asaturyan, R.; Baker, O. K.; Baldwin, A. R.; Barkhuff, D.; Breuer, H.; Carlini, R.; Christy, E.; Churchwell, S.; Cole, Leon J.; Danagoulian, S.; Day, D.; Eden, T.; Elaasar, M.; Ent, R.; Farkhondeh, M.; Fenker, H.; Finn, John M.; Gan, Lu; Gasparian, A.; Garrow, K.; Guèye, P.; Howell, C. R.; Hu, Bingcheng; Jones, M.; Kelly, James; Keppel, C.; Khandaker, M.; Kim, W.-Y.; Kowalski, S.; Lung, A.; Mack, D.; Madey, R.; Manley, D. M.; Markowitz, P.; Mitchell, J.; Mkrtchyan, H.; Opper, A. K.; Perdrisat, C. F.; Punjabi, V.; Raue, B. A.; Reichelt, T.; Reinhold, J.; Roche, J.; Sato, Y.; Savvinov, N.; Семенова, И. А.; W, Seo; Šimičević, N.; Smith, G. D.; Stepanyan, S.; Tadevosyan, V.; Tang, L.; Taylor, S.; Ulmer, P.; Vulcan, W.; Watson, J. W.; Wells, S. P.; Wesselmann, F. R.; Wood, S. A.; Yan, Chao; Yan, Chenyu; Yang, Sung-Chul; Yuan, L.; Zhang, W.-M.; Zhu, Haibin; Zhu, Xiwen

doi:10.1103/physrevc.73.025205

Cited by 76 publications

(20 citation statements)

References 138 publications

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“…Black crosses are experimental results taken from the A1 collaboration [1] for the proton and from Refs. [4,[46][47][48][49][50][51][52][53][54][55][56][57][58][59] for the neutron.…”

Section: B Fits To Lattice Qcd Resultsmentioning

confidence: 99%

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Proton and neutron electromagnetic form factors from lattice QCD

et al. 2019

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The electromagnetic form factors of the proton and the neutron are computed within lattice QCD using simulations with quarks masses fixed to their physical values. Both connected and disconnected contributions are computed. We analyze two new ensembles of N f = 2 and N f = 2 + 1 + 1 twisted mass clover-improved fermions and determine the proton and neutron form factors, the electric and magnetic radii, and the magnetic moments. We use several values of the sink-source time separation in the range of 1.0 fm to 1.6 fm to ensure ground state identification. Disconnected contributions are calculated to an unprecedented accuracy at the physical point. Although they constitute a small correction, they are non-negligible and contribute up to 15% for the case of the neutron electric charge radius.

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“…Black crosses are experimental results taken from the A1 collaboration [1] for the proton and from Refs. [4,[46][47][48][49][50][51][52][53][54][55][56][57][58][59] for the neutron.…”

Section: B Fits To Lattice Qcd Resultsmentioning

confidence: 99%

“…Filled symbols are used for results that include disconnected contributions and open symbols for results without disconnected contributions. Crosses are experimental results taken from Refs [4,[46][47][48][49][50][51][52][53][54][55][56][57][58][59]. for the electric form factor and from Refs [63][64][65][66][67][68].…”

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confidence: 99%

Proton and neutron electromagnetic form factors from lattice QCD

et al. 2019

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“…Similar effects are found in the proton's and neutron's magnetic form factors: below Q 2 $ 2 GeV 2 , the results underestimate the data and, at vanishing photon momentum, yield magnetic moments that are 20-30% smaller than the experimental values; see Table II: for the proton and neutron, they read p ¼ 2:21ð1Þ and n ¼ À1:33ð1Þ, where the brackets denote the sensitivity to . [76,[95][96][97][98][99][100][101][102][103][104][105][106][107][108] and [103][104][105][106][107][108], respectively. The references for G p E are given in Fig.…”

Section: Resultsmentioning

confidence: 99%

Nucleon electromagnetic form factors from the covariant Faddeev equation

2011

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We compute the electromagnetic form factors of the nucleon in the Poincare-covariant Faddeev framework based on the Dyson-Schwinger equations of QCD. The general expression for a baryon's electromagnetic current in terms of three interacting dressed quarks is derived. Upon employing a rainbow-ladder gluon-exchange kernel for the quark-quark interaction, the nucleon's Faddeev amplitude and electromagnetic form factors are computed without any further truncations or model assumptions. The form factor results show clear evidence of missing pion-cloud effects below a photon momentum transfer of ~2 GeV^2 and in the chiral region whereas they agree well with experimental data at higher photon momenta. Thus, the approach reflects the properties of the nucleon's quark core.Comment: 23 pages, 10 figures, 2 table

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“…For the neutron the fit function was reduced to the sum of two dipoles, fit to the world polarized data as of 2008 of Refs. [53,54,70,71,[73][74][75]77,[98][99][100][101]. Again note the addition of early polarized measurements to the data set of Sec.…”

Section: B Results In Coordinate Spacementioning

confidence: 99%

Role of mesons in the electromagnetic form factors of the nucleon

Crawford

Akdoğan

Alarcón³

et al. 2010

Phys. Rev. C

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The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together with the asymptotic Q 2 behavior of perturbative QCD. Specifically, the vector dominance model (GKex) developed by E. L. Lomon is employed, as it is known to be very successful in representing the existing high-quality data published to date. An analysis is made of the experimental uncertainties present when the differences between the GKex model and the data are expanded in orthonormal basis functions. A main motivation for the present study is to provide insight into how the various ingredients in this model yield the measured behavior, including discussions of when dipole form factors are to be expected or not, of which mesons are the major contributors, for instance, at low Q 2 or large distances, and of what effects are predicted from coupling to the continuum. Such insights are first discussed in momentum space, followed by an analysis of how different and potentially useful information emerges when both the experimental and theoretical electric form factors are Fourier transformed to coordinate space. While these Fourier transforms should not be interpreted as "charge distributions," nevertheless the roles played by the various mesons, especially those which are dominant at large or small distance scales, can be explored via such experiment-theory comparisons.

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Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
B. Plaster¹,
A. Yu. Semenov²,
A. Aghalaryan³
et al.

Cited by 76 publications

References 138 publications

Proton and neutron electromagnetic form factors from lattice QCD

Proton and neutron electromagnetic form factors from lattice QCD

Nucleon electromagnetic form factors from the covariant Faddeev equation

Role of mesons in the electromagnetic form factors of the nucleon

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Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia theB. Plaster1, A. Yu. Semenov2, A. Aghalaryan3 et al.

Cited by 76 publications

References 138 publications

Proton and neutron electromagnetic form factors from lattice QCD

Proton and neutron electromagnetic form factors from lattice QCD

Nucleon electromagnetic form factors from the covariant Faddeev equation

Role of mesons in the electromagnetic form factors of the nucleon

Contact Info

Product

Resources

About

Measurements of the neutron electric to magnetic form factor ratioGEn/GMnvia the
B. Plaster¹,
A. Yu. Semenov²,
A. Aghalaryan³
et al.