Measurements of the electric and magnetic form factors of the neutron from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">Q</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>=1.75 to 4.00 (GeV/<i>c</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup><

Lung, A.; Stuart, L. M.; Bosted, P.; Andivahis, L.; Alster, J.; Arnold, R. G.; Chang, C. C.; Dietrich, F. S.; Dodge, W. R.; Gearhart, R.; Gómez, J.; Griffioen, K. A.; Hicks, R. S.; Hyde‐Wright, C. E.; Keppel, C.; Kuhn, S. E.; Lichtenstadt, J.; Miskimen, R.; Peterson, G. A.; Petratos, G. G.; Rock, S. E.; Rokni, S.H.; Sakumoto, W. K.; Spengos, M.; Swartz, K. B.; Szalata, Z. M.; Tao, L. H.

doi:10.1103/physrevlett.70.718

Cited by 189 publications

(77 citation statements)

References 21 publications

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“…The first contains values of proton magnetic form factor data tabulated in [77]. The second contains the proton data and the neutron magnetic form factor data tabulated in [78,79,80,81,82,83,84]. The third contains the proton and neutron data and the two-pion continuum data constructed from pion form factor data and a ππ → NN partial amplitude using (14).…”

Section: Discussionmentioning

confidence: 99%

“…Using the neutron form factor data reported in [78,79,80,81,82,83,84] we fit G n M (q 2 ) = ∞ k=0 a k z(q 2 ) k by minimizing the χ 2 function of (20). For a cut Q 2 ≤ 0.5 GeV 2 we find r n M = 0.74 +0.…”

Section: Neutron Datamentioning

confidence: 99%

“…Since for finite negative q 2 , z is smaller than 1, this guarantees convergence for any q 2 measured in experiment. As an illustration to this intuitive picture, consider the proton magnetic form factor data tabulated in [77] and the neutron magnetic form factor data tabulated in [78,79,80,81,82,83,84]. Plotting the data points as a function of Q 2 = −q 2 for 0 < Q 2 ≤ 1 GeV 2 , we see a considerable curvature, see Figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…For G n M (Q 2 ) we use values published in [78,79,80,81,82,83,84] 2 . We do not use the data reported in [106] and [107], as they were criticized for missing a systematic error, see section VIII of [83] 3 .…”

Section: Proton and Neutron Datamentioning

confidence: 99%

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Model independent extraction of the proton magnetic radius from electron scattering

2014

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We combine constraints from analyticity with experimental electron-proton scattering data to determine the proton magnetic radius without model-dependent assumptions on the shape of the form factor. We also study the impact of including electron-neutron scattering data, and ππ → NN data. Using representative datasets we find for a cut of Q 2 ≤ 0.5 GeV 2 , r p M = 0.91 +0.03 −0.06 ± 0.02 fm using just proton scattering data; r p M = 0.87 +0.04 −0.05 ± 0.01 fm adding neutron data; and r p M = 0.87 +0.02 −0.02 fm adding ππ data. We also extract the neutron magnetic radius from these data sets obtaining r n M = 0.89 +0.03 −0.03 fm from the combined proton, neutron, and ππ data.

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Section: Discussionmentioning

confidence: 99%

Section: Neutron Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Proton and Neutron Datamentioning

confidence: 99%

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Model independent extraction of the proton magnetic radius from electron scattering

2014

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“…Figure 1- on deuterium, combined with knowledge of the free elastic ep scattering cross section, allows one to extract the neutron magnetic form factor in a way that minimizes the dependence of the extraction on the specific deuteron model used. The experiments [46,47] both measured the quasi-elastic 2 H(e, e n) scattering cross section but did not measure the ratio to 2 H(e, e p). The experiments [43,44,50,51] used the double-polarization beam-target asymmetry technique with the (inclusive) reaction 3 He( e, e ) to extract G n M .…”

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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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Generalized parton distributions, nucleon form factors, and large-t processes

Vanderhaeghen

2004

Ann. Phys.

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The connection of generalized parton distributions (GPDs) to processes at large momentum transfer (high-t), and the links between GPDs and elastic nucleon form factors are discussed here. These links, in the form of sum rules, represent powerful constraints on parametrizations of GPDs. A Regge parametrization for the GPDs at small-t, which is surprisingly observed from the chiral quark soliton model results, is extended to the large-t region and it is found to catch the basic features of proton and neutron electromagnetic form factor data. It is furthermore discussed how these GPDs at large-t enter into two-photon exchange processes and resolve the discrepancy between Rosenbluth and polarization experiments of elastic electron nucleon scattering.

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Measurements of the electric and magnetic form factors of the neutron fromQ2=1.75 to 4.00 (GeV/c)2<

Cited by 189 publications

References 21 publications

Model independent extraction of the proton magnetic radius from electron scattering

Model independent extraction of the proton magnetic radius from electron scattering

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

Generalized parton distributions, nucleon form factors, and large-t processes

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