Speaker
Description
Preliminary COMPASS results on the Deeply Virtual Compton Scattering (DVCS) cross section will be presented. They have been obtained from exclusive single-photon production by scattering the 160 GeV muon beams of the SPS M2 beamline off a 2.5 m long liquid hydrogen target. The recoil proton was measured in a barrel-shaped time-of-flight detector surrounding the target. The scattered muons were detected by the COMPASS spectrometer and the photons by electromagnetic calorimeters including a new large-angle calorimeter. We will show the charge-spin average DVCS cross section differential as a function of the squared four-momentum transfer to the proton. This cross section is expected to be sensitive to the transverse extension of partons in the proton. COMPASS allows the first access to the Bjorken-x domain of sea quarks.
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