- Conference date: 24–29 July 2011
- Location: Cambridge, Massachusetts, USA
Hard exclusive leptoproduction of real photons on nucleons and nuclei, Deeply Virtual Compton Scattering (DVCS), is one of the theoretically cleanest ways to access 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 DVCS utilizing the HERA polarized electron or positron beams with an energy of 27.6 GeV 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.
- Compton scattering
- Cumulative distribution functions
- Form factors
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