A glimpse of gluons through deeply virtual compton scattering on the proton

Defurne, M.; Jiménez-Argüello, A. Martí; 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.; Hansén, O.; Higinbotham, D. W.; Holmstrom, T.; Horn, T.; Huang, J.; Huang, Min; 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.; Mazouz, M.; Meddi, F.; Meekins, D.; Michaels, R.; Mihovilovič, M.; 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.; Zhan, X.; Zhang, J.; Zhao, B.; Zhao, Z. W.; Zheng, X.; Zhu, P.

doi:10.1038/s41467-017-01819-3

Cited by 54 publications

(45 citation statements)

References 70 publications

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“…Within the Braun et al [5] formalism, three kind of CFFs F µν ∈ {H µν , E µν , H µν , E µν }, where µ and ν are the helicity state of the virtual photon and outgoing real photon, can be used to describe the DVCS process. Our accurate measurements of the H(e, e γ)p polarized cross sections demonstrated the sensitivity of our data to twist-3 (HT) F 0+ and/or next to leading order (NLO) F −+ contributions involving gluons [6]. Figure 2 shows the separation between the DVCS 2 and the BH-DVCS interference for both scenarios [6].…”

Section: Dvcs Off the Proton Resultssupporting

confidence: 51%

“…Our accurate measurements of the H(e, e γ)p polarized cross sections demonstrated the sensitivity of our data to twist-3 (HT) F 0+ and/or next to leading order (NLO) F −+ contributions involving gluons [6]. Figure 2 shows the separation between the DVCS 2 and the BH-DVCS interference for both scenarios [6]. A significant DVCS 2 contribution to the polarized cross section difference is observed in the HT scenario, assumed to be a purely interference term in DVCS phenomenology up to now.…”

Section: Dvcs Off the Proton Resultsmentioning

confidence: 53%

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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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Section: Dvcs Off the Proton Resultssupporting

confidence: 51%

Section: Dvcs Off the Proton Resultsmentioning

confidence: 53%

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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“…On the other hand, if we consider the antiquark as an active parton and quark as the spectator, the conditions described in Eq. (19) should remain the same, however, the antiquark momentum will now be given as k ⊥1 = −k ⊥ and longitudinal momentum fraction by active antiquark as x 1 = −x. In that case, the quark spectator momentum and longitudinal momentum fraction are taken to be k ⊥2 = k ⊥ and x 2 = 1 + x respectively.…”

Section: Generalized Quark and Antiquark Distributions For Kaon mentioning

confidence: 99%

“…Since the Wigner distributions are interpreted with ζ = 0, the initial and final state momenta and longitudinal momentum fractions can be used by putting ζ = 0 in Eqs. (14)- (19). Further, we can obtain the purely transverse Wigner distributions by integrating them over x as…”

Section: Wigner Distributions Of U Quark Ands Quark In Unpolarizedmentioning

confidence: 99%

“…The GPDs explain through various exclusive processes, the presence of the recoil momentum ∆ ⊥ as the hadron has different initial and final state. Such processes are named as deeply virtual Compton scattering (DVCS) [17][18][19][20][21][22] and hard exclusive meson production (HEMP) [23][24][25]. If the final state has the unpolarized meson with zero spin, one needs to measure the longitudinal cross-section [9].…”

Section: Introductionmentioning

confidence: 99%

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Study of kaon structure using the light-cone quark model

Kaur

Dahiya

2019

Phys. Rev. D

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We investigate the various distributions explaining multi-dimensional structure of kaon at the level of its constituents (u ands) using the light-cone quark model. The overlap form of wavefunctions associated with the light-cone quark model is adopted for the calculations. The generalized parton distributions(GPDs)of u ands quarks are presented for the case when the momentum transfer in the longitudinal direction is non-zero. The dependence of kaon GPDs is studied in terms of variation of quark longitudinal momentum fraction, momentum transfer in longitudinal direction and total momentum transfer to the final state of hadron. The transverse impact-parameter dependent GPDs are also studied by taking the Fourier transformation of general GPDs. Further, the quantum phasespace distributions; Wigner distributions are studied for the case of unpolarized, longitudinallypolarized and transversely-polarized parton in an unpolarized kaon. The Wigner distributions are analysed in the transverse impact-parameter plane, the transverse momentum plane and the mixed plane. Further, to get a complete picture of kaon in terms of its valence quarks, the variation of longitudinal momentum fraction carried by quark and antiquark in the generalized transverse momentum-dependent parton distributions (GTMDs) is studied for different values of transverse quark and antiquark momentum (k ⊥ ) as well as for different values of momentum transferred to the kaon in transverse direction (∆ ⊥ ). This has been done for zero as well as non-zero skewedness representing respectively the absence and presence of momentum transfer to the final state of kaon in longitudinal direction. Furthermore, the possible spin-orbit correlation for u ands in kaon is elaborated in context of Wigner distributions and GTMDs.

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Next-to-leading-power kinematic corrections to DVCS: a scalar target

Braun

Manashov

2023

J. High Energ. Phys.

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Using the recent results on the contributions of descendants of the leading twist operators to the operator product expansion of two electromagnetic currents we derive explicit expressions for the kinematic finite-t and target mass corrections to the DVCS helicity amplitudes to the 1/Q4 power accuracy. The cancellation of IR divergences for kinematic corrections is demonstrated to all powers in the leading order of perturbation theory. We also argue that target mass corrections in the coherent DVCS from nuclei are small and do not invalidate the factorization theorem.

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A glimpse of gluons through deeply virtual compton scattering on the proton

Cited by 54 publications

References 70 publications

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

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

Study of kaon structure using the light-cone quark model

Next-to-leading-power kinematic corrections to DVCS: a scalar target

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