Rosenbluth Separation of the 
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 Electroproduction Cross Section

Defurne, M.; Mazouz, M.; Ahmed, Z.; Al-Bataineh, H.; Allada, K.; Aniol, K.; Bellini, Vincenzo; Benali, M.; Boeglin, W.; Bertin, P.Y.; Brossard, Michel; Camsonne, A.; Canan, M.; Chandavar, S.; Chen, C.; Chen, J. P.; Jager, C. W. de; Лео, Р. Де; Desnault, C.; Deur, A.; Fassi, L. El; Ent, R.; Flay, D.; Friend, M.; Fuchey, E.; Frullani, S.; Garibaldi, F.; Gaskell, D.; Giusa, A.; Glamazdin, O.; Golge, S.; Gómez, J.; Hansen, J. O.; Higinbotham, D. W.; Holmstrom, T.; Horn, T.; Huang, J.; Huang, Min; Huber, G. M.; Hyde‐Wright, C. E.; Iqbal, S.; Itard, F.; Kang, H.; Kelleher, A.; Keppel, C.; Koirala, S.; Korover, I.; LeRose, J.; Lindgren, R.; Long, E.; Magne, M.; Mammei, J.; Margaziotis, D. J.; Markowitz, P.; Jiménez-Argüello, A. Martí; Meddi, F.; Meekins, D.; Michaels, R.; Mihovilovič, M.; Muangma, N.; Camacho, C. Muñoz; Nadel-Turoński, P.; Nuruzzaman, N.; Paremuzyan, R.; Puckett, A. J. R.; Punjabi, V.; Qiang, Y.; Rakhman, A.; Rashad, M. N. H.; Riordan, S.; Roche, J.; Russo, G.; Sabatié, F.; Saenboonruang, Kiadtisak; Saha, A.; Sawatzky, B.; Selvy, L.; Shahinyan, A.; Širca, S.; Solvignon, P.; Sperduto, M. L.; Subedi, R.; Sulkosky, V.; Sutera, C.; Tobias, W. A.; Urciuoli, G. M.; Wang, D.; Wojtsekhowski, B.; Huang, Yao; Ye, Z.; Zana, L.; Zhan, X.; Zhang, J.; Zhao, B.; Zhao, Z. W.; Zheng, X.; Zhu, P.

doi:10.1103/physrevlett.117.262001

Cited by 52 publications

(35 citation statements)

References 26 publications

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“…Predictions for the π 0 electroproduction cross sections given in [12] (see also [13]) revealed a transverse cross section that is much larger than the longitudinal one. This prediction has been confirmed by a recent measurement of the separated π 0 cross sections performed by the Jefferson Lab Hall A Collaboration [14]. The longitudinal cross section is found to be compatible with zero within the experimental errors.…”

Section: Introductionsupporting

confidence: 72%

“…The GPDs at small x control the behavior of the associated flavor form factors at small −t, whereas large x determine their large −t behavior which is required for wide-angle photoproduction of mesons. As is obvious from (14) at small x the first term of the profile function dominates while at large x its second term is important. In analyses of deeply virtual exclusive processes, as electroproduction of photons or meson, for which only data at rather small −t are available, the so-called Regge-like profile function is frequently used.…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 83%

“…Clearly, in view of the x − t correlation, we can only learn about the GPDs at small x from data on deeply virtual exclusive processes; an extrapolation to large x and large −t is dangerous and may lead to misleading results. 2 The parameter A of the second term in (14) cannot be fixed from small −t data. Information on the large −t (large x) behavior of the GPDs is for instance obtained from the electromagnetic form factors of the nucleon.…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

“…In analyses of deeply virtual exclusive processes, as electroproduction of photons or meson, for which only data at rather small −t are available, the so-called Regge-like profile function is frequently used. This profile function is just the first term of (14) with the factor ð1 − xÞ 3 being dropped. Clearly, in view of the x − t correlation, we can only learn about the GPDs at small x from data on deeply virtual exclusive processes; an extrapolation to large x and large −t is dangerous and may lead to misleading results.…”

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

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Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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We investigate wide-angle π 0 photoproduction within the handbag approach to twist-3 accuracy. In contrast to earlier work both the 2-particle as well as the 3-particle twist-3 contributions are taken into account. It is shown that both are needed for consistent results that respect gauge invariance and crossing properties. The numerical studies reveal the dominance of the twist-3 contribution. With it fair agreement with the recent CLAS measurement of the π 0 cross section is obtained. We briefly comment also on wide-angle photoproduction of other pseudoscalar mesons.

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Section: Introductionsupporting

confidence: 72%

Section: Gpds and Form Factors At Large-tmentioning

confidence: 83%

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

Section: Gpds and Form Factors At Large-tmentioning

confidence: 99%

See 2 more Smart Citations

Twist-3 contributions to wide-angle photoproduction of pions

Kroll

Passek‐Kumerički

2018

Phys. Rev. D

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“…The Rosenbluth separation of σ T and σ L is achieved for the first time thanks to cross section measurements at two different beam energies at fixed Q 2 and x B . Figure 3 illustrates the results of this separation for the proton, the neutron and the deuteron [8,9]. The d(e, e π 0 )d structure functions are found compatible with zero within uncertainties.…”

Section: π 0 Electroproduction Resultsmentioning

confidence: 91%

Photon and $\pi^0$ electroproduction in Jlab Hall A (6 GeV experiements)

Mazouz¹

2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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Generalized Parton Distribution (GPDs) are universal functions which provide a comprehensive description of hadron properties in terms of quarks and gluons. GPDs can be accessed experimentally with hard exclusive processes such as Deeply Virtual Compton Scattering (DVCS) and deeply virtual π 0 production. Two experiments were performed in the Hall A of Jefferson Lab to measure the unpolarized cross sections of these two processes off the proton and off the neutron in the valence region (x B =0,36) at Q 2 ≈2 GeV 2 . After a brief description of the experimental setup, the DVCS off the proton results will be discussed and interpreted as being unexpectedly sensitive to gluons. Then, the longitudinal/transverse separation of the π 0 electoproduction cross sections, showing a dominance of the transverse terms, will be presented. Finally, an estimation of the quarks up and down contributions to the π 0 electroproduction cross sections, by combining the proton and the neutron measurements, will be shown.

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Kim¹

2018

Light Cone 2016

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The instanton vacuum picture is used to study hadronic matrix elements of the twist-3 (dimension-4, spin-1) QCD operators measuring the quark spin density and spin-orbit correlations. The QCD operators are converted to effective operators in the low-energy effective theory emerging after chiral symmetry breaking, in a systematic approach based on the diluteness of the instanton medium and the 1/N c expansion. The instanton fields induce spin-flavor-dependent "potential" terms in the effective operators, complementing the "kinetic" terms from the quark field momenta. As a result, the effective operators obey the same equation-of-motion relations as the original QCD operators. The spin-orbit correlations are qualitatively different from naive quark model expectations.

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Rosenbluth Separation of the π0 Electroproduction Cross Section

Cited by 52 publications

References 26 publications

Twist-3 contributions to wide-angle photoproduction of pions

Twist-3 contributions to wide-angle photoproduction of pions

Photon and $\pi^0$ electroproduction in Jlab Hall A (6 GeV experiements)

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