Electromagnetic form factors of the nucleon in chiral perturbation theory including vector mesons

Schindler, Matthias R.; Gegelia, J.; Scherer, Stefan

doi:10.1140/epja/i2005-10145-8

Cited by 76 publications

(99 citation statements)

References 28 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also for the magnetic FFs, a good description is only obtained once the vector mesons are included. The results of Schindler et al [Schi05] in a covariant χPT calculation and using a consistent power counting scheme which includes to fourth order both vector meson pole and loop contributions are also shown in Fig. 35.…”

Section: Chiral Perturbation Theorymentioning

confidence: 91%

“…One recovers the con- The results of [Kub01] including vector mesons are shown to third (dashed curves) and fourth (solid curves) orders. The results of [Schi05] to fourth order are displayed both without vector mesons (dotted curves) and when including vector mesons (dashed-dotted curves). For references to the data : G M p (see Fig.…”

Section: Lattice Qcd and Chiral Extrapolation 451 Lattice Simulationsmentioning

confidence: 99%

See 1 more Smart Citation

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

461

582

View full text Add to dashboard Cite

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.

show abstract

Section: Chiral Perturbation Theorymentioning

confidence: 91%

Section: Lattice Qcd and Chiral Extrapolation 451 Lattice Simulationsmentioning

confidence: 99%

Nucleon electromagnetic form factors

Perdrisat

Punjabi

Vanderhaeghen

2007

Progress in Particle and Nuclear Physics

461

582

View full text Add to dashboard Cite

show abstract

“…The electromagnetic form factors of the nucleon have been calculated to fourth order (one-loop) in baryon chiral perturbation theory within the manifestly Lorentz-invariant infrared regularization approach [31] and the extended on-mass-shell renormalization scheme [32,33]. The inclusion of vector mesons as explicit degrees of freedom results in a considerably improved description, accurate up to Q 2 − ∼ 0.4 GeV 2 .…”

mentioning

confidence: 99%

Electroweak structure of the nucleon, meson cloud, and light-cone wave functions

Pasquini¹,

Boffi

2007

Phys. Rev. D

View full text Add to dashboard Cite

The meson-cloud model of the nucleon consisting of a system of three valence quarks surrounded by a meson cloud is applied to study the electroweak structure of the proton and neutron. Light-cone wavefunctions are derived for the dressed nucleon as pictured to be part of the time a bare nucleon and part of the time a baryon-meson system. Configurations are considered where the baryon can be a nucleon or a ∆ and the meson can be a pion as well as a vector meson such as the ρ or the ω. An overall good description of the electroweak form factors is obtained.The contribution of the meson cloud is small and only significant at low Q 2 . Mixedsymmetry S ′ -wave components in the wavefunction are most important to reproduce the neutron electric form factor. Charge and magnetization densities are deduced as a function of both the radial distance from the nucleon center and the transverse distance with respect to the direction of the three-momentum transfer. In the latter case a central negative charge is found for the neutron. The up and down quark distributions associated with the Fourier transform of the axial form factor have opposite sign, with the consequence that the probability to find an up (down) quark with positive helicity is maximal when it is (anti)aligned with the proton helicity.

show abstract

“…[35] with point-like constituent quarks; thick solid curve: front form calculation of Frank et al [29]; dashed curve: point form calculation of Boffi et al [36] in the Goldstone boson exchange model with point-like constituent quarks; thin solid curve: covariant spectator model of Gross and Agbakpe [37]. 1-17 The proton form factors in the relativistic baryon χPT of [40] (IR scheme) and [41] (EOMS scheme). The results of [40] including vector mesons are shown to third (dashed curves) and fourth (solid curves) orders.…”

Section: High Precision Measurement Of the Proton Elastic Formmentioning

confidence: 99%

“…The results of [40] including vector mesons are shown to third (dashed curves) and fourth (solid curves) orders. The results of [41] to fourth order are displayed both without vector mesons (dotted curves) and when including vector mesons (dashed-dotted curves). 1-24 Recent world high precision polarization data [16,19,20] compared to several fits [47,24,48,44] and parameterizations [49,36,50,51].…”

Section: High Precision Measurement Of the Proton Elastic Formmentioning

confidence: 99%

High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q<sup>2</sup>

Zhan

2010

View full text Add to dashboard Cite

Experiment E08-007 measured the proton elastic form factor ratio µ p G E /G M in the range of Q 2 = 0.3−0.7(GeV/c) 2 by recoil polarimetry. Data were taken in 2008 at the Thomas Jefferson National Accelerator Facility in Virginia, USA. A 1.2 GeV polarized electron beam was scattered off a cryogenic hydrogen target. The recoil proton was detected in the left HRS in coincidence with the elasticly scattered electrons tagged by the BigBite spectrometer. The proton polarization was measured by the focal plane polarimeter (FPP).In this low Q 2 region, previous measurement from Jefferson Lab Hall A (LEDEX) along with various fits and calculations indicate substantial deviations of the ratio from unity. For this new measurement, the proposed statistical uncertainty (< 1%) was achieved. These new results are a few percent lower than expected from previous world data and fits, which indicate a smaller G Ep at this region. Beyond the intrinsic interest in nucleon structure, the new results also have implications in determining the proton Zemach radius and the strangeness form factors from parity violation experiments.

show abstract

Electromagnetic form factors of the nucleon in chiral perturbation theory including vector mesons

Cited by 76 publications

References 28 publications

Nucleon electromagnetic form factors

Nucleon electromagnetic form factors

Electroweak structure of the nucleon, meson cloud, and light-cone wave functions

High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q<sup>2</sup>

Contact Info

Product

Resources

About