Contribution invited talk
GPD program at COMPASS at CERN
Investigation of GPDs and TMDs represents one of the major goals of the COMPASS-II program. Together, GPDs and TMDs provide the most complete description of the partonic structure of the nucleon. GPDs are experimentally accessible via lepton-induced exclusive reactions, in particular DVCS and DVMP. At COMPASS, these processes are investigated using the 160 GeV polarized muon beams. The DVCS cross-section and its |t|-dependence are extracted from the sum of cross-sections measured with opposite muon beam charges and polarizations. From this measurement, a first estimate of the transverse extension of the partons in the proton probed in the sea quark range will be reported.