Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on an unpolarized deuterium target

Airapetian, A.; Акопов, Н.; Akopov, Z.; Amarian, M.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetisyan, E.; Ball, B.; Belostotski, S.; Bianchi, N.; Blok, H.P.; Böttcher, H.; Borissov, A.; Bowles, J.; Bryzgalov, V.; Burns, J.; Capiluppi, M.; Capitani, G. P.; Cisbani, E.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.; Deconinck, W.; Лео, Р. Де; Nardo, L. De; Sanctis, E. De; Diefenthaler, M.; Nezza, P. Di; Dreschler, J.; Düren, M.; Ehrenfried, M.; Elbakian, G.; Ellinghaus, F.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Gabbert, D.; Gapienko, G.; Гапиенко, В. А.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Giordano, F.; Gliske, S.; Hadjidakis, C.; Hartig, M.; Hasch, D.; Hasegawa, T.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hristova, I.; Imazu, Y.; Ivanilov, A.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Jo, H. S.; Joosten, S.; Kaiser, R.; Karyan, G.; Keri, T.; Kinney, E.; Kisselev, A.; Kobayashi, N.; Коротков, В. А.; Kozlov, V.; Krauß, Bernhard; Kravchenko, P.; Krivokhijine, V. G.; Lagamba, L.; Lamb, R.; Lapikás, L.; Lehmann, I.; Lenisa, P.; Linden-Levy, L. A.; Ruiz, A.; Lorenzon, W.; Lu, X.-G.; Lu, X. R.; Q., B.; Mahon, D.; Makins, N.; Manaenkov, S. I.; Manfré, L.; Mao, Y.; Mariański, B.; Ossa, A. Martínez de la; Marukyan, H.; Miller, C. A.; Miyachi, Y.; Movsisyan, A.; Muccifora, V.; Müller, Dieter; Murray, M.; Mussgiller, A.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W.-D.; Pappalardo, L. L.; Pérez-Benito, R.; Pickert, N.; Raithel, Martin; Reimer, P. E.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rosner, G.; Rostomyan, A.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanftl, F.; Schäfer, Andreas; Schnell, G.; Schüler, K. P.; Seitz, B.; Shibata, T. A.; Shutov, V.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Stenzel, H.; Stewart, J.; Stinzing, F.; Taroian, S.; Terkulov, A.; Trzciński, A.; Tytgat, M.; Vandenbroucke, A.; Nat, P. B. van der; Haarlem, Y. Van; Hulse, C. Van; Varanda, M.; Veretennikov, D.; Vikhrov, V.; Vilardi, I.; Vogel, Christian; Wang, S.; Yaschenko, S.; Ye, H.; Ye, Z.; Yen, S.; Yu, W.; Zeiler, D.; Zihlmann, B.; Żuprański, P.

doi:10.1016/j.nuclphysb.2009.12.004

Cited by 37 publications

(7 citation statements)

References 70 publications

(85 reference statements)

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“…The results in this paper may be relevant for the experiments at JLab and a future EIC [38] and for the proposed fixed-target projects @LHC [39], where different polarized hadrons and nuclei can be employed. Current data for spin-1 tomography is rather scarce, with HERMES having measured deeply virtual Compton scattering (DVCS) on the deuteron with both unpolarized [40] and polarized targets [41]. In these measurements, hadrons were not detected in the final state, but simulations were used to select a sample of enhanced coherent deuteron contribution.…”

Section: Introductionmentioning

confidence: 99%

The energy-momentum tensor of spin-1 hadrons: formalism

et al. 2019

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We provide the complete decomposition of the local gauge-invariant energy-momentum tensor for spin-1 hadrons, including non-conserved terms for the individual parton flavors and antisymmetric contributions originating from intrinsic spin. We state sum rules for the gravitational form factors appearing in this decomposition and provide relations for the mass decomposition, work balance, total and orbital angular momentum, mass radius, and inertia tensor. Generalizing earlier work, we derive relations between the total and orbital angular momentum and the Mellin moments of twist-2 and 3 generalized parton distributions, accessible in hard exclusive processes with spin-1 targets. Throughout the work, we comment on the unique features in these relations originating from the spin-1 nature of the hadron, being absent in the lower spin cases. * wim.cosyn@ugent.be † sabrina.cotogno@polytechnique.edu ‡ afreese@anl.gov § cedric.lorce@polytechnique.edu 1 We call the form factors "gravitational" since the EMT is usually understood as the source of gravitational interactions. However, we do not measure in practice these form factors through gravity and we do not know the exact form that a theory of quantum gravity will take. Thus, it is unclear whether gravitation sees the symmetric, Belinfante-improved EMT as in general relativity or an asymmetric EMT as in Einstein-Cartan theory [3]. Despite this, we refer to all form factors appearing in either the symmetric or asymmetric EMT as "gravitational" form factors.

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Section: Introductionmentioning

confidence: 99%

The energy-momentum tensor of spin-1 hadrons: formalism

et al. 2019

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“…COMPASS focussed on a little larger x B -from ' 0:01 to ' 0:1 [23]. The data from HERMES is in the range 0:03 < x B < 0:35 [24,25]. The study of the high x B domain, where valence quarks should dominate, requires high luminosity and a high energy electron beam.…”

Section: Introductionmentioning

confidence: 99%

First moments of nucleon generalized parton distributions

Wang

Thomas

2010

Phys. Rev. D

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We extrapolate the first moments of the generalized parton distributions using heavy baryon chiral perturbation theory. The calculation is based on the one loop level with the finite range regularization. The description of the lattice data is satisfactory and the extrapolated moments at physical pion mass are consistent with the results obtained with dimensional regularization, although the extrapolation in the momentum transfer to t = 0 does show sensitivity to form factor effects which lie outside the realm of chiral perturbation theory. We discuss the significance of the results in the light of modern experiments as well as QCD inspired models.

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“…Using data collected with longitudinally polarised electron and positron beams and unpolarised, longitudinally and transversely polarised hydrogen and deuterium targets, it was possible to measure asymmetries with respect to beam charge, beam polarisation and target polarisation alone and also with respect to their different combinations. Full references for the HERMES DVCS results can be found in [14][15][16][17][18][19][20]. Complementary information on GPDs can be obtained from measurements of hard exclusive meson production processes + N → + N + V .…”

Section: Generalized Parton Distributionsmentioning

confidence: 99%

HERMES Results on the 3D Imaging of the Nucleon

Pappalardo

2016

Few-Body Syst

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It the last decades, a formalism of transverse momentum dependent parton distribution functions (TMDs) and of generalised parton distributions (GPDs) has been developed in the context of non-perturbative QCD, opening the way for a tomographic imaging of the nucleon structure. TMDs and GPDs provide complementary three-dimensional descriptions of the nucleon structure in terms of parton densities. They thus contribute, with different approaches, to the understanding of the full phase-space distribution of partons. A selection of HERMES results sensitive to TMDs is presented

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Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on an unpolarized deuterium target

Cited by 37 publications

References 70 publications

The energy-momentum tensor of spin-1 hadrons: formalism

The energy-momentum tensor of spin-1 hadrons: formalism

First moments of nucleon generalized parton distributions

HERMES Results on the 3D Imaging of the Nucleon

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