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AbstractAbstract
[en] The proton's elastic electromagnetic form factors are calculated using an ansatz for the nucleon's Poincare covariant Faddeev amplitude that only retains scalar diquark correlations. A spectator approximation is employed for the current. On the domain of q2 accessible in modern precision experiments these form factors are a sensitive probe of nonperturbative strong interaction dynamics. The ratio of Pauli and Dirac form factors can provide realistic constraints on models of the nucleon and thereby assist in developing an understanding of nucleon structure. (author)
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AbstractAbstract
[en] Nucleon form factors are calculated on q2(set-membership sign)[0,3] GeV2 using an ansatz for the nucleon's Faddeev amplitude motivated by quark-diquark solutions of the relativistic Faddeev equation. Only the scalar diquark is retained, and it and the quark are confined. A good description of the data requires a nonpointlike diquark correlation with an electromagnetic radius of 0.8 rπ. The composite, nonpointlike nature of the diquark is crucial. It provides for diquark-breakup terms that are of greater importance than the diquark photon absorption contribution. (c) 1999 The American Physical Society
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Numerical Data
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de Jager, Kees
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Science (United States)
arXiv e-print [ PDF ]2010
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Science (United States)
arXiv e-print [ PDF ]2010
AbstractAbstract
[en] A proposed set of instrumentation, collectively referred to as the Super Bigbite project, is presented. Used in three different configurations it will allow measurements of three nucleon electromagnetic form factors GEn, GEp, and GMn with unprecedented precision to Q2-values up to three times higher than existing data.
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1 Jun 2010; 12 p; International conference on nuclear reactions on nucleons and nuclei; Messina (Italy); 5-9 Oct 2009; DOE/OR--23177-1051; AC05-06OR23177; Available from International Journal of Modern Physics E; Volume 19, No.5-6, pages 844-855; doi 10.1142/S0218301310015308
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Report
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Franz Gross; Peter Agbakpe
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research ER (United States)2004
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research ER (United States)2004
AbstractAbstract
[en] We show that all four of the nucleon form factors can be very well explained using the manifestly covariant spectator theory. The nucleon is modeled as a spherical state of three constituent quarks with electromagnetic form factors, all determined by the fit to the data
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16 Nov 2004; 493.9 Kilobytes; DOE/ER--40150-2962; AC--05-84ER40150; Available from PURL: https://www.osti.gov/servlets/purl/834354-gR63bm/native/
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Abbott, David; Ahmidouch, Abdellah; Anklin, H.; Arvieux, J.; Ball, James P.; Beedoe, Shelton; Beise, Elizabeth; Bimbot, Louis; Boeglin, Werner; Breuer, Herbert; Carlini, Roger; Chant, Nicholas; Danagoulian, Samuel; Dow, K.; Ducret, Jean-Eric; Dunne, Jim; Ewell, Lars; Eyraud, L.; Furget, C.; Garcon, Michel; Gilman, Ron; Glashausser, Charles; Gueye, Paul; Gustafsson, Kenneth; Hafidi, Kawtar; Honegger, A.; Jourdan, J.; Kox, Serge; Kumbartzki, Gerfried; Lu, L.; Lung, Allison; Markowitz, Pete; McIntyre, Justin; Meekins, David; Merchez, F.; Mitchell, Joseph; Mohring, R.; Mtingwa, S.; Mrktchyan, H.; Pitz, D.; Qin, Liming; Ransome, Ronald; R'eal, J.-S.; Roos, Philip; Rutt, Paul; Sawafta, Reyad; Stepanyan, Stepan; Tieulent, Raphael; Tomasi-Gustafsson, E.; Turchinetz, William; Vansyoc, K.; Volmer, J.; Voutier, E.; Williamson, Claude; Wood, Stephen; Yan, Chen; Zhao, Jianguo; Zhao, W.
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2000
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2000
AbstractAbstract
[en] A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the 4-momentum transfer, is presented. Then the world data for elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm. This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data
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25 Feb 2000; 157 Kilobytes; DOE/ER--40150-2102; NUCL-EX--0002003; AC05-84ER40150; Available from PURL: https://www.osti.gov/servlets/purl/796074-xR3IQK/native/; No journal information given for this preprint
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David Abbott; Abdellah Ahmidouch; H. Anklin; J. Arvieux; James P. Ball; Shelton Beedoe; Elizabeth Beise; Louis Bimbot; Werner Boeglin; Herbert Breuer; Roger Carlini; Nicholas Chant; Samuel Danagoulian; K. Dow; Jean-Eric Ducret; Jim Dunne; Lars Ewell; L. Eyraud; C. Furget; Michel Garcon; Ron Gilman; Charles Glashausser; Paul Gueye; Kenneth Gustafsson; Kawtar Hafidi; A. Honegger; J. Jourdan; Serge Kox; Gerfried Kumbartzki; L. Lu; Allison Lung; Pete Markowitz; Justin McIntyre; David Meekins; F. Merchez; Joseph Mitchell; R. Mohring; S. Mtingwa; H. Mrktchyan; D. Pitz; Liming Qin; Ronald Ransome; J.-S. R'eal; Philip Roos; Paul Rutt; Reyad Sawafta; Stepan Stepanyan; Raphael Tieulent; E. Tomasi-Gustafsson; William Turchinetz; K. Vansyoc; J. Volmer; E. Voutier; Claude Williamson; Stephen Wood; Chen Yan; Jianguo Zhao; W. Zhao
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2000
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2000
AbstractAbstract
[en] A rigorous extraction of the deuteron charge form factors from tensor polarization data in elastic electron-deuteron scattering, at given values of the 4-momentum transfer, is presented. Then the world data for elastic electron-deuteron scattering is used to parameterize, in three different ways, the three electromagnetic form factors of the deuteron in the 4-momentum transfer range 0-7 fm. This procedure is made possible with the advent of recent polarization measurements. The parameterizations allow a phenomenological characterization of the deuteron electromagnetic structure. They can be used to remove ambiguities in the form factors extraction from future polarization data
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Source
JLAB-PHY--00-30; DOE/ER/40150--2102; NUCL-EX--0002003; AC05-84ER40150
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Journal Article
Journal
European Physical Journal. A; ISSN 1434-6001;
; v. 7(3); p. 7

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Bhagwat, M.S.; Cloet, I.C.; Roberts, C.D.
Argonne National Laboratory (United States). Funding organisation: USDOE Office of Science (United States)2007
Argonne National Laboratory (United States). Funding organisation: USDOE Office of Science (United States)2007
AbstractAbstract
[en] We summarize applications of Dyson-Schwinger equations to the theory and phenomenology of hadrons. Some exact results for pseudoscalar mesons are highlighted with details relating to the UA(1) problem. We describe inferences from the gap equation relating to the radius of convergence for expansions of observables in the current-quark mass. We recapitulate upon studies of nucleon electromagnetic form factors, providing a comparison of the ln-weighted ratios of Pauli and Dirac form factors for the neutron and proton.
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1 Jan 2007; 9 p; Exclusive Reactions at High Momentum Transfer; Newport News, VA (United States); 21-24 May 2007; AC02-06CH11357; Available from Proc., pp. 112-120World Scientific Publishing Company, Hackensack, NJ 07601 (US); doi 10.1142/9789812796950_0010
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Frederic Bonnet; Robert Edwards; George Fleming; Randal Lewis; David Richards
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research ER (United States)2004
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research ER (United States)2004
AbstractAbstract
[en] We report on a program to compute the electromagnetic form factors of mesons. We discuss the techniques used to compute the pion form factor and present results computed with domain wall valence fermions on MILC asqtad lattices, as well as with Wilson fermions on quenched lattices. The methods can easily be extended to rho-to-gamma-pi transition form factors
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1 Dec 2004; 368.2 Kilobytes; DOE/ER--40150/3024; HEP-LAT/0411028; AC--05-84ER40150; Available from PURL: https://www.osti.gov/servlets/purl/834960-MStU91/native/
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K.A. Aniol; D.S. Armstrong; T. Averett; H. Benaoum; P.Y. Bertin; E. Burtin; J. Cahoon; G.D. Cates; C.C. Chang; Y.-C. Chao; J.-P. Chen; Seonho Choi; E. Chudakov; B. Craver; F. Cusanno; Piotr Decowski; D. Deepa; C. FERDI; R.J. Feuerbach; J.M. Finn; S. Frullani; K. Fuoti; F. Garibaldi; R. Gilman; A. Glamazdin; V. Gorbenko; J.M. Grames; J. Hansknecht; D.W. Higinbotham; R. Holmes; T. Holmstrom; T.B. Humensky; H. Ibrahim; C.W. de Jager; X. Jiang; L.J. Kaufman; A. Kelleher; A. Kolarkar; S. Kowalski; K.S. Kumar; D. Lambert; P. LaViolette; J. LeRose; D. Lhuillier; N. Liyanage; M. Mazouz; K. McCormick; D.G. Meekins; Z.-E. Meziani; R. Michaels; B. Moffit; P. Monaghan; C. Munoz-Camacho; S. Nanda; V. Nelyubin; D. Neyret; K.D. Paschke; M. Poelker; R. Pomatsalyuk; Y. Qiang; B. Reitz; J. Roche; A. Saha; J. Singh; R. Snyder; P.A. Souder; R. Subedi; R. Suleiman; V. Sulkosky; W.A. Tobias; G.M. Urciuoli; A. Vacheret; E. Voutier; K. Wang; R. Wilson; B. Wojtsekhowski; X. Zheng
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2005
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2005
AbstractAbstract
[en] We report the most precise measurement to date of a parity-violating asymmetry in elastic electron-proton scattering. The measurement was carried out with a beam energy of 3.03 GeV and a scattering angle <θlab> = 6.0 degrees, with the result APV = -1.14 ± 0.24 (stat) ± 0.06 (syst) parts per million. From this we extract, at Q2 = 0.099 GeV2, the strange form factor combination GEs + 0.080 GMs = 0.030 ± 0.025 (stat) ± 0.006 (syst) ± 0.012 (FF) where the first two errors are experimental and the last error is due to the uncertainty in the neutron electromagnetic form factor. The measurement significantly improves existing constraints on GEs and GMs at Q2 ∼0.1 GeV2. A consistent picture emerges from all measurements at this Q2. A combined fit shows that GEs is consistent with zero while GMs prefers positive values though GEs = GMs = 0 is compatible with the data at 95% C.L
Primary Subject
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1 Jun 2005; 134.3 Kilobytes; DOE/ER--40150-3458; NUCL-EX/0506011; AC05-84ER40150; Available from PURL: https://www.osti.gov/servlets/purl/841463-tgNdTY/native/; No journal information given for this preprint
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Brash, Ed; Kozlov, A.; Li, Sh.; Huber, Garth
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2002
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States). Funding organisation: USDOE Office of Energy Research (ER) (United States)2002
AbstractAbstract
[en] Recent measurements of the ratio of the elastic electromagnetic form factors of the proton, GEp/GMp, using the polarization transfer technique at Jefferson Lab show that this ratio decreases dramatically with increasing Q2, in contradiction to previous measurements using the Rosenbluth separation technique. Using this new high quality data as a constraint, we have reanalyzed most of the world e-p elastic cross section data. In this paper, we present a new empirical fit to the reanalyzed data for the proton elastic magnetic form factor in the region 0 < Q2 < 30 GeV2. As well, we present an empirical fit to the proton electromagnetic form factor ratio, GEp/GMp, which is valid in the region 0.1 < Q2 < 6 GeV2
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JLAB-PHY--02-41; DOE/ER--40150-2315; HEP-EX--0111038; AC05-84ER40150; Phys.Rev.C65:051001,2002
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Journal Article
Journal
Physical Review. C, Nuclear Physics; ISSN 0556-2813;
; v. 65; p. 5

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