Publisher's Note: 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:msup><mml:mi fontstyle="normal">GeV</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>by polarization transfer [Phys. Rev. C 71, 055202 (2005)]

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. A.; Calarco, J. R.; Cardman, L. S.; Chai, Z.; Chang, C. C.; 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, Juncai; 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, Xiang; Jones, M. K.; Kahl, W.; Kelly, James; Khayat, M.; Kramer, L. H.; 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.; 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.V.; Strauch, S.; Suleiman, R.; Takahashi, Koichi; 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.71.069902

Cited by 173 publications

(186 citation statements)

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“…Moreover, as shown, this fit predicted the new BLAST low momentum transfer results [40,41] well and is in excellent agreement with the very recent results at higher Q 2 from JLab [43]. The deviation from unity is substantial for Q 2 > 0.8 (GeV/c) 2 ; indeed, as stated in the previous section, this has always been a 045211-6 [26] together with the fitted data (Gayou et al [38], Punjabi et al [39], and Ron et al [40]; see the end of Sec. II) and recent measurements from BLAST (Crawford et al [41]) and JLab (Puckett et al [43]).…”

Section: Results In Momentum Space Andsupporting

confidence: 76%

“…The R p data used in the fit were the polarization measurements of Refs. [38,39] and (not shown) the ratio extracted from a Rosenbluth separation [42], while the results presented in Refs. [40,41] were not used in the fit.…”

Section: Results In Momentum Space Andmentioning

confidence: 76%

“…II) together with the polarization data [38][39][40][41]. The R p data used in the fit were the polarization measurements of Refs.…”

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 Andsupporting

confidence: 76%

Section: Results In Momentum Space Andmentioning

confidence: 76%

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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 SD model predicts that F 2 (Q 2 )/F 1 (Q 2 ) → 1/Q 2 for large Q [1,8]. The experimental results obtained at the Jefferson lab [9][10][11][12][13], however, showed that the ratio F 2 (Q 2 )/F 1 (Q 2 ) ∼ 1/Q in the energy range 2 GeV 2 < Q 2 < 8.5 GeV 2 . This contradicted the prediction of the SD model that some thought had been established.…”

Section: Introductionmentioning

confidence: 99%

The Dirac form factor predicts the Pauli form factor in the Endpoint Model

2016

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We compute the momentum-transfer dependence of the proton Pauli form factor F 2 in the Endpoint overlap Model. We find the model correctly reproduces the scaling of the ratio of F 2 with the Dirac form factor F 1 observed at the Jefferson Laboratory. The calculation uses the leadingpower, leading-twist Dirac structure of the quark light-cone wave function and the same endpoint dependence previously determined from the Dirac form factor F 1 . There are no parameters and no adjustable functions in the Endpoint Model's prediction for the scaling behavior of F 2 . The model's predicted momentum dependence of the ratio F 2 (Q 2 )/F 1 (Q 2 ) is quite insensitive to the endpoint wave function, which explains why the observed ratio scales like 1/Q down to rather low momentum transfers. We also fit the magnitude of this ratio by adjusting the parameters of the wave function. The Endpoint Model appears to be the only comprehensive model consistent with all form factor information as well as reproducing fixed-angle proton-proton scattering at large momentum transfer. Any one of the processes is capable of predicting the others.

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“…Substantial progress has been achieved in this field over the past decade, mainly thanks to new experimental methods, using polarization observables, which allow for precise measurements of the FFs. The results for the proton FFs, obtained over the past few years at JLab [4][5][6][7] up to a momentum transfer Q 2 ' 8:5 GeV 2 , considerably boosted our knowledge about the distribution of the electric charge inside the proton. A substantial program to extend the measurements of the nucleon FFs up to Q 2 ' 15 GeV 2 in the spacelike region will be performed in the near future at the JLab 12 GeV upgrade.…”

Section: Introductionmentioning

confidence: 96%

Soft spectator scattering in the nucleon form factors at largeQ2within the soft collinear effective theory approach

Kivel

Vanderhaeghen

2011

Phys. Rev. D

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The proton form factors at large momentum transfer are dominated by two contributions which are associated with the hard and soft rescattering, respectively. Motivated by a very active experimental form factor program at intermediate values of momentum transfers, Q 2 $ 5-15 GeV 2 , where an understanding in terms of only a hard rescattering mechanism cannot yet be expected, we investigate in this work the soft rescattering contribution using soft collinear effective theory (SCET). Within such a description, the form factor is characterized, besides the hard scale Q 2 , by a hard-collinear scale QÃ, which arises due to the presence of soft spectators, with virtuality Ã 2 (Ã $ 0:5 GeV), such that Q 2 ) QÃ ) Ã 2 . We show that in this case a two-step factorization can be successfully carried out using the SCET approach. In a first step (SCET I ), we perform the leading-order matching of the QCD electromagnetic current onto the relevant SCET I operators and perform a resummation of large logarithms using renormalization group equations. We then discuss the further matching onto a SCET II framework, and propose the factorization formula (accurate to leading logarithmic approximation) for the Dirac form factor, accounting for both hard and soft contributions. We also present a qualitative discussion of the phenomenological consequences of this new framework.

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Publisher's Note: Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer [Phys. Rev. C 71, 055202 (2005)]

Cited by 173 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

The Dirac form factor predicts the Pauli form factor in the Endpoint Model

Soft spectator scattering in the nucleon form factors at largeQ2within the soft collinear effective theory approach

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