Measurement of Deeply Virtual Compton Scattering at HERA
H1 Collaboration
Abstract
A measurement is presented of elastic deeply virtual Compton scattering γ* p γp made using e+ p collision data corresponding to a luminosity of 46.5 pb-1, taken with the H1 detector at HERA. The cross section is measured as a function of the photon virtuality, Q2, the invariant mass of the γ* p system, W, and for the first time, differentially in the squared momentum transfer at the proton vertex, t, in the kinematic range 2 < Q2 < 80 GeV2, 30 < W < 140 GeV and |t| < 1 GeV2. QCD based calculations at next-to-leading order using generalized parton distributions can describe the data, as can colour dipole model predictions.
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