Marukyan, H. (2013) Exclusive reactions at HERMES. Il nuovo cimento C, 36 (5). pp. 55-60. ISSN 1826-9885
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Abstract
Exclusive scattering processes can, in principle, constrain the parton’s angular momentum through its connection to the nucleon Generalized Parton Distributions (GPDs). The HERMES experiment at DESY, Hamburg, collected a wealth of data on hard exclusive leptoproduction of real photons, deeply virtual Compton scattering, or a meson utilizing the HERA polarized electron or positron beams with energy of 25.6 GeV and various polarized or unpolarized internal gas targets. The measured exclusive-photon cross-sections are bilinear in the Compton form factors, the flavor-sums of convolutions of GPDs with hard scattering kernels, while the most informative observables, which could isolate the real or imaginary parts of certain linear combinations of GPDs, are the asymmetries measured with respect to the beam and/or target polarizations. An overview of HERMES results on cross-sections and asymmetries from hard exclusive processes, and their ability to constrain various GPDs are presented.
| Item Type: | Article |
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| Uncontrolled Keywords: | Photon and charged-lepton interactions with hadrons ; Meson production ; Elastic and Compton scattering ; Quarks, gluons, and QCD in nuclear reactions |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 06 May 2020 16:15 |
| Last Modified: | 06 May 2020 16:15 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/18317 |
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