Yaschenko, S. (2012) HERMES results on hard exclusive processes. Il nuovo cimento C, 35 (2). pp. 289-294. ISSN 1826-9885
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Abstract
Hard exclusive leptoproduction of real photons or mesons on nucleons and nuclei can provide access to Generalized Parton Distributions (GPDs). The theoretical framework of GPDs includes parton distribution functions and form factors as limiting cases and as moments of GPDs, respectively, and can provide a multidimensional representation of the structure of hadrons at the partonic level. The HERMES experiment at DESY, Hamburg, collected a wealth of data on Deeply Virtual Compton Scattering (DVCS) and exclusive meson production utilizing the HERA polarized electron or positron beams with an energy of 27.6GeV and longitudinally and transversely polarized or unpolarized gas targets (H, D or heavier nuclei). The azimuthal asymmetries measured in the DVCS process allow access to the imaginary and/or real part of certain combinations of GPDs. For the last two years of HERA running, the HERMES collaboration installed a recoil detector to improve the selection of DVCS events by direct measurement of the recoil protons. An overview of recent HERMES results on DVCS including first results obtained with the recoil detector is presented.
| Item Type: | Article |
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| Uncontrolled Keywords: | Photon and charged-lepton interactions with hadrons ; Polarization in interactions and scattering |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 19 Apr 2020 14:50 |
| Last Modified: | 19 Apr 2020 14:50 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/17795 |
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