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Crawford, Chris; Sindile, A.; Akdoğan, T.; Alarcón, R.; Bertozzi, W.; Booth, E.C.; Botto, T.; Calarco, J. R.; Clasie, B.; DeGrush, Adam J.; Donnelly, T. W.; Dow, K.; Dutta, D.; Farkhondeh, M.; Fatemi, R.; Filoti, O.; Franklin, Wilbur A.; Gao, H.; Geis, E.; Gilad, S.; Haeberli, W.; Hasell, D.; Hersman, W.; Holtrop, M.; Karpius, Peter Joseph; Köhl, M.; Kolster, H.; Lee, T.; Maschinot, A.; Matthews, J.; McIlhany, K.; Meitanis, N.; Milner, R.; Redwine, R.; Seely, J.; Shinozaki, Ayako; Širca, S.; Six, E.; Smith, T.; Tonguç, Barış Tamer; Tschalaer, C.; Tsentalovich, E.; Turchinetz, W.; Brand, J. van den; Laan, J. van der; Wang, F.; Wise, T.; Xiao, Yong; Xü, Wei-Jiang; Zhang, Cheng; Zhou, Zhengfang; Ziskin, V.; Zwart, T.

doi:10.1103/physrevlett.98.052301

Cited by 119 publications

(61 citation statements)

References 73 publications

(94 reference statements)

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“…Finally, polarisation measurements have also been used to improve high-Q 2 measurements of G p E , where the cross-section is dominated by the contribution from G p M . Two measurements used the cross-section asymmetry on polarised proton targets [59,60], but most measurements, including all the high-Q 2 extractions, have used recoil polarisation [4,5,61,62,63,64]. Along with taking advantage of the increased sensitivity to G p E in the transverse polarisation transfer (or perpendicular asymmetry), some experiments have made simultaneous extractions of the longitudinal and transverse polarisation transfer.…”

Section: Polarised Elastic Scattering and Ratio Measurementsmentioning

confidence: 99%

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Nucleon electromagnetic form factors

Arrington

Roberts

Zanotti

2007

J. Phys. G: Nucl. Part. Phys.

244

266

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Abstract. Elastic electromagnetic nucleon form factors have long provided vital information about the structure and composition of these most basic elements of nuclear physics. The form factors are a measurable and physical manifestation of the nature of the nucleons' constituents and the dynamics that binds them together. Accurate form factor data obtained in recent years using modern experimental facilities has spurred a significant reevaluation of the nucleon and pictures of its structure; e.g., the role of quark orbital angular momentum, the scale at which perturbative QCD effects should become evident, the strangeness content, and meson-cloud effects. We provide a succinct survey of the experimental studies and theoretical interpretation of nucleon electromagnetic form factors.

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Section: Polarised Elastic Scattering and Ratio Measurementsmentioning

confidence: 99%

“…By taking the ratio of these components, one maintains sensitivity [61], squares [63], stars [64], and hollow circles [4,5,62]. The polarised target measurements are shown as hollow stars [59], and crosses [60]. The solid line is a linear fit to the JLab data, Figure 4.…”

Section: Polarised Elastic Scattering and Ratio Measurementsmentioning

confidence: 99%

Nucleon electromagnetic form factors

Arrington

Roberts

Zanotti

2007

J. Phys. G: Nucl. Part. Phys.

244

266

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“…In the RCS (upper) half of the calorimeter, since there are only 30 blocks per row, two groups in each row have only seven blocks. The grouping in the RCS blocks is xxA (1-8), xxB(9-15), xxC (16)(17)(18)(19)(20)(21)(22)(23), and xxD (24)(25)(26)(27)(28)(29)(30), where xx is again the row number which runs from 33-56. The sums of eight are referred to as the "first-level" sums for reasons related to the BigCal trigger.…”

Section: Bigcal Electromagnetic Calorimetermentioning

confidence: 99%

“…In the Protvino (lower) half, each row has 32 blocks so the grouping is quite natural. The groups are referred to as xxA (1)(2)(3)(4)(5)(6)(7)(8), xxB(9-16), xxC (17)(18)(19)(20)(21)(22)(23)(24), and xxD (25)(26)(27)(28)(29)(30)(31)(32), where xx is the row number. In the RCS (upper) half of the calorimeter, since there are only 30 blocks per row, two groups in each row have only seven blocks.…”

Section: Bigcal Electromagnetic Calorimetermentioning

confidence: 99%

“…Figure 1-6 shows a representative sample of data obtained from both cross section and polarization experiments on the proton form factor ratio [19,28,20,22,25] aration experiments. Experiments [31,33,35,36,37] used recoil polarization, while [30,34] used polarized targets and measured the beam-target asymmetry (1.96). The polarization transfer experiments at high Q 2 [33,31] revealed with high precision a strong deviation from the empirical scaling law µ p G p E /G p M = 1 and from all existing Rosenbluth separation data at similar Q 2 .…”

Section: Existing Nucleon Form Factor Datamentioning

confidence: 99%

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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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Elastic form factor experiments: a serial story

Köhl¹

2011

Pavi09

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Measurement of the Proton’s Electric to Magnetic Form Factor Ratio fromH→1(e→,e′<

Cited by 119 publications

References 73 publications

Nucleon electromagnetic form factors

Nucleon electromagnetic form factors

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

Elastic form factor experiments: a serial story

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