Proton elastic form factor ratios to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>Q</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup><mml:mo>=</mml:mo><mml:mn>3.5</mml:mn><mml:mspace width="0.3em" /><mml:mtext>GeV</mml:mtext><mml:msup><mml:mi /><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>by polarization transfer

Punjabi, V.; Perdrisat, C. F.; Aniol, K.; Baker, F. T.; Berthot, J.; Bertin, P.Y.; Bertozzi, W.; Besson, A.; Bimbot, L.; Boeglin, W.; Brash, E. J.; Brown, D. S.; Calarco, J. R.; Cardman, L.; Chai, Z.; Cc, Chang; Chen, J. P.; Chudakov, E.; Churchwell, S.; Cisbani, E.; Dale, D.; Лео, Р. Де; Deur, A.; Diederich, B.; Domingo, J.; Epstein, M. B.; Ewell, L.; Fissum, Kevin; Fleck, Andre; Fonvieille, H.; Frullani, S.; Gao, J.; Garibaldi, F.; Gasparian, A.; Gerstner, G. M.; Gilad, S.; Gilman, R.; Glamazdin, A.; Glashausser, C.; Gómez, J.; Gorbenko, V.; Green, A.; Hansen, J. O.; Howell, C.R.; Huber, G. M.; Iodice, M.; Jager, C. W. de; Jaminion, S.; Jiang, X.; Jones, M.; Kahl, W.; Kelly, James; Khayat, M.; Kramer, L.; Kumbartzki, G.; Kuss, M.; Lakuriki, E.; Laveissière, G.; LeRose, J.; Liang, M.; Lindgren, R.; Liyanage, N.; Lolos, G. J.; Macri, R. A.; Madey, R.; Malov, S.; Margaziotis, D. J.; Markowitz, P.; McCormick, K.; McIntyre, Justin I.; Meer, R. L. J. van der; Michaels, R.; Milbrath, Brian D.; Mougey, J.; Nanda, S.; Offermann, E.A.J.M.; Papandreou, Z.; Pentchev, L.; Petratos, G. G.; Пискунов, Н. М.; Pomatsalyuk, R.; Prout, D. L.; Qúeḿener, G.; Ransome, R. D.; Raue, B. A.; Roblin, Y.; Roché, R.; Rutledge, G.; Rutt, P. M.; Saha, A.; Saito, T.; Sarty, A. J.; Smith, T.; Sorokin, P.; Strauch, S.; Suleiman, R.; Takahashi, Kazunori; Templon, J. A.; Todor, L.; Ulmer, P. E.; Urciuoli, G. M.; Vernin, P.; Vlahović, Branislav; Voskanyan, H.; Wijesooriya, K.; Wojtsekhowski, B.; Woo, R. J.; Xiong, Feng; Zainea, George Dan; Zhou, Zhengfang

doi:10.1103/physrevc.71.055202

Cited by 348 publications

(132 citation statements)

References 99 publications

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“…Traditionally they have been extracted under the assumption of one-photon exchange via the Rosenbluth cross section in (4.40). It came as quite a surprise when the polarisation transfer measurements at Jefferson Lab revealed a ratio G p E /G p M that falls off and points towards a zero crossing at larger Q 2 [568][569][570][571], in stark contrast to the Rosenbluth measurements which had predicted a constant ratio. The question of the zero crossing for G p E is not yet settled because the experimental errors are still too large, but the situation is expected to change in the near future with the Jefferson Lab 12 GeV program where measurements in Halls A, B and C will extend the data range for G p E , G n E , and G n M up to the 10 -14 GeV 2 region [572].…”

Section: Nucleon Electromagnetic Form Factorsmentioning

confidence: 88%

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Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

418

530

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We review the spectrum and electromagnetic properties of baryons described as relativistic three-quark bound states within QCD. The composite nature of baryons results in a rich excitation spectrum, whilst leading to highly non-trivial structural properties explored by the coupling to external (electromagnetic and other) currents. Both present many unsolved problems despite decades of experimental and theoretical research. We discuss the progress in these fields from a theoretical perspective, focusing on nonperturbative QCD as encoded in the functional approach via Dyson-Schwinger and Bethe-Salpeter equations. We give a systematic overview as to how results are obtained in this framework and explain technical connections to lattice QCD. We also discuss the mutual relations to the quark model, which still serves as a reference to distinguish 'expected' from 'unexpected' physics. We confront recent results on the spectrum of non-strange and strange baryons, their form factors and the issues of two-photon processes and Compton scattering determined in the DysonSchwinger framework with those of lattice QCD and the available experimental data. The general aim is to identify the underlying physical mechanisms behind the plethora of observable phenomena in terms of the underlying quark and gluon degrees of freedom.

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Section: Nucleon Electromagnetic Form Factorsmentioning

confidence: 88%

“…In this respect, new experiments with polarised beams and/or polarised targets performed at Jefferson Lab allowed to extract the ratio G E /G M directly. However, the resulting ratio disagrees with the scaling predictions and shows a falloff with t, even pointing towards a zero crossing at larger t [568][569][570][571].…”

Section: Overview Of Two-photon Physicsmentioning

confidence: 95%

Baryons as relativistic three-quark bound states

Eichmann

Sanchis-Alepuz

Williams

et al. 2016

Progress in Particle and Nuclear Physics

418

530

View full text Add to dashboard Cite

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“…We demonstrate that application of the technique provides a dramatic improvement in On the left, the ratio G E /G M for the proton from application of the Feynman-Hellmann method, from a variational analysis of three-point functions, and from experiment [37,4,3]. On the right, the scaled pion form factor Q 2 F π from the Feynman-Hellmann technique and from experiment [7].…”

Section: Resultsmentioning

confidence: 99%

“…[1,2,3,4]). Experimental results at high-momentum scales are not yet precise enough to determine whether this trend continues and there is a zero crossing.…”

Section: Introductionmentioning

confidence: 99%

Hadron Structure from the Feynman-Hellmann Theorem

Chambers¹,

Dragos²,

Horsley³

et al. 2017

Proceedings of 34th Annual International Symposium on Lattice Field Theory — PoS(LATTICE2016)

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The determination of hadronic form factors at large momentum transfers has been a challenging problem in lattice QCD simulations. Here we show how the Feynman-Hellmann method may be extended to non-forward matrix elements to calculate hadronic form factors in lattice QCD at much higher momenta than previously accessible. We are able to determine the electromagnetic form factors of the pion and nucleon up to approximately 6 GeV 2 , with results for G E /G M in the proton agreeing well with experimental results. 34th annual International Symposium on Lattice Field Theory

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“…All partial contributions have been renormalised to produce unity at Q 2 = 0. Data: circles (blue) [19]; squares (green) [20]; asterisks (brown) [21]; and diamonds (purple) [22]. Upper-Right panel: The electromagnetic γ * N → ∆ transition is described by three Poincaré-invariant form factors [24]: magnetic-dipole, G * M , electric quadrupole, G * E , and Coulomb (longitudinal) quadrupole, G * C ; that can be extracted in the Dyson-Schwinger approach by a sensible set of projection operators [25].…”

Section: Fig 2 Upper-left Panelmentioning

confidence: 99%

$$\mathbf {\gamma _{v} NN^{*}}$$ γ v NN ∗ Electrocouplings in Dyson–Schwinger Equations

Segovia

2016

Few-Body Syst

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A symmetry preserving framework for the study of continuum Quantum Chromodynamics (QCD) is obtained from a truncated solution of the QCD equations of motion or QCD's DysonSchwinger equations (DSEs). A nonperturbative solution of the DSEs enables the study of, e.g., hadrons as composites of dressed-quarks and dressed-gluons, the phenomena of confinement and dynamical chiral symmetry breaking (DCSB), and therefrom an articulation of any connection between them. It is within this context that we present a unified study of Nucleon, Delta and Roper elastic and transition electromagnetic form factors, and compare predictions made using a framework built upon a Faddeev equation kernel and interaction vertices that possess QCD-like momentum dependence with results obtained using a symmetry-preserving treatment of a vector ⊗ vector contact-interaction. The comparison emphasises that experiment is sensitive to the momentum dependence of the running coupling and masses in QCD and highlights that the key to describing hadron properties is a veracious expression of dynamical chiral symmetry breaking in the bound-state problem.

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Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer

Cited by 348 publications

References 99 publications

Baryons as relativistic three-quark bound states

Baryons as relativistic three-quark bound states

Hadron Structure from the Feynman-Hellmann Theorem

$$\mathbf {\gamma _{v} NN^{*}}$$ γ v NN ∗ Electrocouplings in Dyson–Schwinger Equations

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