Determination of the neutron electric form factor in the D(e,e′n)p reaction and the influence of nuclear binding

Herberg, C.; Ostrick, M.; Andresen, H. G.; Annand, J. R. M.; Aulenbacher, K.; Becker, Jan; Drescher, P.; Eyl, D.; Frey, A.; Grabmayr, P.; Hall, S.J.; Hartmann, Péter; Hehl, T.; Heil, W.; Hoffmann, J.; Ireland, D. G.; Kellie, J. D.; Клейн, Ф.; Livingston, K.; Nachtigall, Ch.; Natter, A.; Otten, Ernst W.; Owens, R.O.; Reichert, E.; Rohe, D.; Schmieden, H.; Sprengard, R.; Steigerwald, Michael L.; Steffens, K.; Walcher, Th.; Watson, R.

doi:10.1007/s100500050268

Cited by 198 publications

(62 citation statements)

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“…4 very well. The values obtained from Rosenbluth separations [45,56,57,59,[69][70][71][72][73][74][75][76][77] would be much higher than those, but are not plotted because of their greater sensitivity to the two-photon corrections and the nuclear target model dependence. Figures 1-6 show not only the data at low Q 2 , the main focus of this study, but also over an expanded range to see the small structures in the data and models better.…”

Section: Results In Momentum Space Andmentioning

confidence: 99%

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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%

“…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 model-dependent data are taken from [12] and the dot-dashed line is the dispersion-theoretical fit of [1]. The filled cross indicates the result of the Mainz D( e, e ′ n) experiment [13].…”

Section: Neutrals the Magnetic Momentsmentioning

confidence: 99%

Baryon form factors

Kubis¹,

Hemmert²,

Meißner³

1999

Physics Letters B

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We calculate the form factors of the baryon octet in the framework of heavy baryon chiral perturbation theory. The calculated charge radius of the Σ − is in agreement with recent measurements from CERN and Fermilab. We show that kaon loop effects can play a significant role in the neutron electric form factor. Furthermore, we derive generalized Caldi-Pagels relations between various charge radii which are free of chiral loop effects.

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“…The neutron electric form factor is the most poorly known of the four nucleon form factors. Figure 1- [53,55,56,58,60]. A full discussion of the technical and theoretical challenges involved in measuring the neutron form factors is somewhat beyond the scope of this thesis, which is concerned with the proton form factors.…”

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confidence: 99%

Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to High Momentum Transfer

Puckett

2010

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The electromagnetic form factors of the nucleon characterize the effect of its internal structure on its response to an electromagnetic probe as studied in elastic electronnucleon scattering. These form factors are functions of the squared four-momentum transfer Q 2 between the electron and the proton. The two main classes of observables of this reaction are the scattering cross section and polarization asymmetries, both of which are sensitive to the form factors in different ways. When considering large momentum transfers, double-polarization observables offer superior sensitivity to the electric form factor. This thesis reports the results of a new measurement of the ratio of the electric and magnetic form factors of the proton at high momentum transfer using the recoil polarization technique. A polarized electron beam was scattered from a liquid hydrogen target, transferring polarization to the recoiling protons. These protons were detected in a magnetic spectrometer which was used to reconstruct their kinematics, including their scattering angles and momenta, and the position of the interaction vertex. A proton polarimeter measured the polarization of the recoiling protons by measuring the azimuthal asymmetry in the angular distribution of protons scattered in CH 2 analyzers. The scattered electron was detected in a largeacceptance electromagnetic calorimeter in order to suppress inelastic backgrounds. The measured ratio of the transverse and longitudinal polarization components of the scattered proton is directly proportional to the ratio of form factors G AcknowledgmentsThis thesis would not have been possible without the support and efforts of many, many people. It would be impossible to give all due credit to all of the individual efforts that went into designing, planning, staging, and executing this experiment, and the subsequent analysis of the data. Therefore, any omissions from the following acknowledgments are in no way meant to diminish those contributions.I would like to thank the members of the GEp-III collaboration whose tireless efforts made experiments E04-108 and E04-019 a success. This includes the spokespeople; Ed Brash, Mark Jones, Charles Perdrisat and Vina Punjabi, and the other outstanding physicists involved in the core collaboration. I thank Frank Wesselmann for his successful leadership of the testing, installation, commissioning and operation of the Focal Plane Polarimeter, and his significant contribution to the data analysis in the form of the event decoding and tracking software for the FPP drift chambers. I thank Mark Jones for his encyclopedic knowledge of experimental Hall C and for his outsized contribution to making the various parts of the experiment work together as a whole, and for being called upon more often than not to troubleshoot problems with the experiment as they occurred. Mark's many important contributions to the data analysis included the optimization of the HMS reconstruction coefficients. Much of what I have learned about the actual hands-on require...

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Determination of the neutron electric form factor in the D(e,e′n)p reaction and the influence of nuclear binding

Cited by 198 publications

References 0 publications

Role of mesons in the electromagnetic form factors of the nucleon

Role of mesons in the electromagnetic form factors of the nucleon

Baryon form factors

Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to High Momentum Transfer

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