Precise Measurement of the Neutron Magnetic Form Factor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi>G</mml:mi><mml:mi>M</mml:mi><mml:mi>n</mml:mi></mml:msubsup></mml:math>in the Few-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>GeV</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>Region

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.

show abstract

“…data [68] are a little lower in the midrange and this reinforces the tendency to go below the dipole fit. Figure 6 shows that Fig.…”

Section: Results In Momentum Space Andmentioning

confidence: 60%

“…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

Self Cite

View full text Add to dashboard Cite

show abstract

“…We find that G p E = 0 at Q 2 = 6.60 (GeV/c) 2 for case I and Q 2 = 6.12 (GeV/c) 2 for case II. The form factor for the time-like momentum, |G|, is given for the proton in [20], Anklin et al [21], Kubon et al [28], Madey et al [41], Xu et al [29], Anderson et al [6], and Lachniet et al [7].…”

Section: We Give Inmentioning

confidence: 99%

“…(ii) For the neutron magnetic form factor, G n M , very accurate experimental data were obtained and it approximately satisfies G n M (Q 2 )/µ n ≈ G D (Q 2 ) = (1 + Q 2 /0.71) −2 , with Q being represented in terms of GeV/c, for a fairly wide range of squared momentum transfer, Q 2 = 1.4-4.8 (GeV/c) 2 [6,7] (CLAS Collaboration). (iii) For the time-like momentum the ratio |G p E /G p M | was estimated [8,9], (BABAR Collaboration), whereas previously the data of form factors had been analyzed under the assumption G p…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Electromagnetic form factors of nucleons with QCD constraints: Systematic study of space- and time-like regions

2010

View full text Add to dashboard Cite

Elastic electromagnetic form factors of nucleons are investigated for both the time-like and the space-like momenta by using the unsubtracted dispersion relation with QCD constraints. It is shown that the calculated form factors reproduce the experimental data reasonably well; they agree with recent experimental data for the neutron magnetic form factors for the space-like data obtained by the CLAS Collaboration and are compatible with the ratio of the electric and magnetic form factors for the time-like momentum obtained by the BABAR Collaboration.

show abstract

Elastic form factor experiments: a serial story

Köhl¹

2011

Pavi09

View full text Add to dashboard Cite

Precise Measurement of the Neutron Magnetic Form FactorGMnin the Few-GeV2Region

Cited by 91 publications

References 28 publications

Role of mesons in the electromagnetic form factors of the nucleon

Role of mesons in the electromagnetic form factors of the nucleon

Electromagnetic form factors of nucleons with QCD constraints: Systematic study of space- and time-like regions

Elastic form factor experiments: a serial story

Contact Info

Product

Resources

About