Measurements of Deeply Virtual Compton Scattering from HERMES (past and future)

Generalized Parton Distributions (GPDs) provide a way to access to the total angular momenta of partons and give a more complete picture of the nucleon structure than the ordinary Parton Distribution Functions (PDFs). Deeply Virtual Compton Scattering (DVCS) is the most direct exclusive process to study GPDs. Different azimuthal cross-section asymmetries of the DVCS and Bethe-Heitler (BH) interference term have been measured in the HERMES experiment. In January 2006 a Recoil Detector was installed at HERMES to upgrade the existing spectrometer to be able to exclusively measure the recoiling proton. The HERMES experiment took data with the Recoil Detector until the end of the HERA running, June 2007.