Measurement of deeply virtual Compton scattering at HERA

Abstract A measurement is presented of elastic deeply virtual Compton scattering e + + p → e + + γ + p at HERA using data taken with the H1 detector. The cross section is measured as a function of the photon virtuality, Q 2 , and the invariant mass, W , of the γp system, in the kinematic range 2 2 GeV 2 , 30 GeV and |t| GeV 2 , where t is the squared momentum transfer to the proton. The measurement is compared to QCD based calculations.