Beam charge asymmetries for deeply virtual Compton scattering off the proton

Burkert, Volker; Elouadrhiri, L.; Girod, F. X.; Niccolai, S.; Voutier, E.; Afanasev, A.; Barion, L.; Battaglieri, M.; Bernauer, J. C.; Bianconi, A.; Capobianco, R.; Caudron, M.; Causse, L.; Chatagnon, P.; Chetry, T.; Ciullo, G.; Cole, P. L.; Contalbrigo, M.; Costantini, G.; Defurne, M.; Deur, A.; Diehl, Stefan; Ehrhart, M.; Fernando, Ishara P.; Filippi, A.; Forest, T. A.; Grames, J.; Guèye, P.; Habet, S.; Higinbotham, D. W.; Hobart, A.; Hyde, C.; Joo, K. S.; Kim, A.; Klimenko, V.; Ko, H.-S.; Kubarovsky, V.; Leali, M.; Lenisa, P.; Mascagna, V.; McCaughan, M.; McKinnon, B.; Movsisyan, A.; Camacho, C. Muñoz; Pappalardo, L. L.; Pasyuk, E.; Poelker, M.; Price, K.; Raue, B. A.; Shabestari, M.; Santos, R. Felix dos; Sergeyeva, V.; Strakovsky, I. I.; Stoler, P.; Venturelli, L.; Zhao, Shengying; Zhao, Z. W.

doi:10.1140/epja/s10050-021-00474-z

Cited by 18 publications

(8 citation statements)

References 38 publications

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“…In this work, we follow the previous setup and extend it to non-zero skewness, which allows us to also include the exclusive measurements in the global analysis. With such a program, we perform the global analysis of GPDs that includes global PDFs [19][20][21], FFs [22] and DVCS measurements from both JLab [9][10][11][12] and previous H1 [37] experiments at Hadron-Electron Ring Accelerator (HERA) along with the relevant lattice calculations related to GPDs [17,23] for the first time.…”

Section: Jhep05(2023)150mentioning

confidence: 99%

“…Several recent breakthroughs have made this possible. Large data sets of exclusive measurements are generated at Jefferson Lab (JLab) [9][10][11][12], and more will come from the planned Electron-Ion Collider (EIC) [13,14] at Brookhaven National Lab (BNL). Additionally, novel developments in lattice QCD allow the access to the nucleon structures from first principle calculation [15][16][17][18], providing information almost impossible to get with current and future experiments.…”

Section: Introductionmentioning

confidence: 99%

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Generalized parton distributions through universal moment parameterization: non-zero skewness case

Guo

Santiago³

et al. 2023

J. High Energ. Phys.

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We present the first global analysis of generalized parton distributions (GPDs) combing lattice quantum chromodynamics (QCD) calculations and experiment measurements including global parton distribution functions (PDFs), form factors (FFs) and deeply virtual Compton scattering (DVCS) measurements. Following the previous work where we parameterize GPDs in terms of their moments, we extend the framework to allow for the global analysis at non-zero skewness. Together with the constraints at zero skewness, we fit GPDs to global DVCS measurements from both the recent JLab and the earlier Hadron-Electron Ring Accelerator (HERA) experiments with two active quark flavors and leading order QCD evolution. With certain choices of empirical constraints, both sea and valence quark distributions are extracted with the combined inputs, and we present the quark distributions in the proton correspondingly. We also discuss how to extend the framework to accommodate more off-forward constraints beyond the small ξ expansion, especially the lattice calculated GPDs.

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Section: Jhep05(2023)150mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generalized parton distributions through universal moment parameterization: non-zero skewness case

Guo

Santiago³

et al. 2023

J. High Energ. Phys.

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“…where ⊕ denotes quadrature addition (a ⊕ b = √ a 2 + b 2 ), an uncorrelated 3% systematic uncertainty has been added [41], and N i is the number of expected BH/DVCS events in the bin. This number of events is given by the product of the luminosity, data taking duration, differential cross-section and phase space volume element.…”

Section: Generation Of Pseudo Datamentioning

confidence: 99%

Impact of a positron beam at JLab on an unbiased determination of DVCS Compton Form Factors

Dutrieux,

Bertone,

Moutarde

et al. 2021

Preprint

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The impact of potential future measurements of beam charge asymmetries on the current knowledge of Compton form factors is evaluated. Elaborating on the results of a global neural network fit to deeply virtual Compton scattering data, a Bayesian reweighting analysis quantifies the improved determination of the real part of the Compton form factor H. Such an improvement is particularly relevant for the experimental determination of the proton mechanical properties or for universality studies of generalized parton distributions through analyses of virtual Compton scattering in both spacelike and timelike regions.

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“…Encoded in this process are the important information of the nucleon such as the mass, angular momentum and mechanical properties [1,4,5] and the three-dimensional structure of the nucleon [6][7][8]. There have been numerous measurements from HERA (H1 [9][10][11][12], ZEUS [13,14] and HERMES [15,16]) and Jefferson Lab (JLab) (CLAS [17][18][19][20][21][22][23][24] and Hall A [25][26][27][28][29]) spanning decades, and more programs are planned in the future such as the JLab 24 GeV, EIcC [30] and EIC [31].…”

Section: Introductionmentioning

confidence: 99%

Twist-three cross-sections in deeply virtual Compton scattering

Guo

Kriesten³

et al. 2022

J. High Energ. Phys.

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We study the deeply virtual Compton scattering process with both twist-two and twist-three Compton form factors and present our cross-sections formulas with all polarization configurations. While the twist-three contributions are generally assumed to be negligible in the literature due to the kinematical suppression, we compare them with the twist-two ones at typical JLab 6 GeV and 12 GeV kinematics as well as EIC kinematics and show their kinematical suppression explicitly, justifying the leading-twist approximation made in the literature. In addition, we also estimate the twist-three Compton form factors using Wandzura-Wilczek relations and inputs of twist-two generalized parton distributions based on a reggeized spectator model. With those estimated Compton form factors, we analyze the kinematical behavior of twist-two and twist-three cross-sections in a wide range of kinematics, and discuss the optimal regions for separating the leading-twist effects from the higher-twist ones.

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Beam charge asymmetries for deeply virtual Compton scattering off the proton

Cited by 18 publications

References 38 publications

Generalized parton distributions through universal moment parameterization: non-zero skewness case

Generalized parton distributions through universal moment parameterization: non-zero skewness case

Impact of a positron beam at JLab on an unbiased determination of DVCS Compton Form Factors

Twist-three cross-sections in deeply virtual Compton scattering

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