Measurement of the magnetic form factor of the neutron

Markowitz, P.; Finn, John M.; Anderson, B. D.; Arenhövel, H.; Baldwin, A. R.; Barkhuff, D.; Beard, K.; Bertozzi, W.; Cameron, J.M.; Chang, C. C.; Dodson, G.; Dow, K.; Eden, T.; Farkhondeh, M.; Flanders, B. S.; Hyde‐Wright, C. E.; Jiang, Wenmian; Keane, D.; Kelly, James; Korsch, W.; Kowalski, S.; Lourie, R.; Madey, R.; Manley, D. M.; Mougey, J.; Ni, Bingbing; Payerle, T.; Pella, P.J.; Reichelt, T.; Rutt, P. M.; Spraker, M.; Tieger, D.; Turchinetz, W.; Ulmer, P. E.; Verst, S. Van; Watson, J. W.; Weinstein, L. B.; Whitney, R. R.; Zhang, W. M.

doi:10.1103/physrevc.48.r5

Cited by 121 publications

(47 citation statements)

References 29 publications

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“…All of the G n M data [36,[56][57][58][59][60][61][62][63][64][65][66], except the recent JLab data [67,68], were used in the 2005 fit. As seen in [26] and the Galster et al [27] parametrization with the fitted data (Madey et al [52] and Warren et al [53]; see the end of Sec.…”

Section: Results In Momentum Space Andmentioning

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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Section: Results In Momentum Space Andmentioning

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 status of our experimental knowledge of G mn from coincidence measurements was clouded by two recent (e, e ′ n) experiments that claimed to provide accurate data [18,19] which, however, greatly differed from the ones shown in fig. 2.…”

Section: Ingredients 21 Nucleon Form Factorsmentioning

confidence: 99%

Elastic electron scattering from light nuclei

Sick

2001

Progress in Particle and Nuclear Physics

108

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The charge and magnetic form factors of light nuclei, mainly for mass number A≤4, provide a sensitive test of our understanding of nuclei. A number of "exact" calculations of the wave functions starting from the nucleon-nucleon interaction are available. The treatment of two-body effects needed in the calculation of the electromagnetic form factors has made significant progress. Many electron scattering experiments have provided an extensive data base from which the various (mainly elastic) form factors can be extracted. This review discusses the data and the determination of the form factors, and compares them to the results of theory.

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“…Experimental data are from Refs. [25] (open diamonds), [26] (full diamonds), [27] (full squares), [24] (full dots) and [28] (open squares). Fig.…”

Section: Figure Captionsmentioning

confidence: 99%

Nucleon and pion electromagnetic form factors in a light-front constituent quark model

et al. 1995

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Nucleon and pion electromagnetic form factors are evaluated in the spacelike region within a light-front constituent quark model, where eigenfunctions of a mass operator, reproducing a large set of hadron energy levels, are adopted and quark form factors are considered in the one-body current. The hadron form factors are sharply affected by the high momentum tail generated in the wave function by the one-gluon-exchange interaction. Useful information on the electromagnetic structure of light constituent quarks can be obtained from the comparison with nucleon and pion experimental data.The measurement of the electromagnetic (e.m.) form factors of hadrons represents a valuable tool for investigating in detail their internal structure. This fact has motivated a great deal of experimental and theoretical work, that will increase with the advent of new accelerator facilities, e.g. CEBAF, yielding unique information on the transition region from the non perturbative to the perturbative regime of QCD [1,2]. Though the fundamental theory of the strong interaction, QCD, should be applied for describing hadron structure, the practical difficulties to be faced in the nonperturbative regime have motivated the development of effective theories, e.g. constituent quark (CQ) models, that in turn could provide useful hints to model approximations to the "true" field theory [3]. Aim of this letter is to apply our approach [4,5], based on a relativistic CQ model, to the evaluation of the nucleon e.m. form factors in the spacelike region, keeping safe the good description already obtained for the pion form factor. Our model represents an extension of the one proposed in Refs. [6,7], where a relativistic treatement of light CQ's is achieved by adopting the light-front formalism [8] and gaussian wave functions are assumed for describing the pointlike CQ's inside the nucleon (see also [9]). In particular we have considered: i) hadron wave functions which are eigenvectors of a light-front mass operator, constructed from the effective qq and qq-interaction of Refs. [10,11], that reproduces a huge amount of energy levels; ii) the configuration mixing, due to the one-gluon-exchange (OGE) part of the effective interaction, leading to high momentum components and SU(6) breaking terms in the hadron wave function; iii) Dirac and Pauli form factors for the CQ's, as suggested by their quasi-particle nature (cf. [12]), summarizing the underlying degrees of freedom. The comparison of our calculations with the experimental data on nucleon and pion form factors will phenomenologically constrain the e.m. structure of the light CQ's.As known (cf.[8]), the light-front wave functions of hadrons are eigenvectors of a mass operator, e.g. M = M 0 + V, and of the non-interacting angular momentum operators j 2 and j n , where the vectorn = (0, 0, 1) defines the spin quantization axis. The operator M 0 is the free mass and the interaction term V is a Poincaré invariant. In this letter we briefly present the formalism for the nucleon only, since the r...

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Measurement of the magnetic form factor of the neutron

Cited by 121 publications

References 29 publications

Role of mesons in the electromagnetic form factors of the nucleon

Role of mesons in the electromagnetic form factors of the nucleon

Elastic electron scattering from light nuclei

Nucleon and pion electromagnetic form factors in a light-front constituent quark model

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