Measurement of deeply virtual Compton scattering at HERA

doi:10.1140/epjc/s2005-02345-3

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2023 Impact factor 4.2

Particles and Fields

Eur. Phys. J. C (2005) 44: 1-11
https://doi.org/10.1140/epjc/s2005-02345-3

experimental physics

Measurement of deeply virtual Compton scattering at HERA

The H1 Collaboration

Abstract

A measurement is presented of elastic deeply virtual Compton scattering $\gamma^* p \rightarrow {\ensuremath{\gamma}} p$ 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, Q ², the invariant mass of the $\ensuremath{\gamma^*}$ p system, W, and for the first time, differentially in the squared momentum transfer at the proton vertex, t, in the kinematic range $2 < Q^{ 2} < 80 {\rm GeV}^2$ , $30 < W < 140 {\rm GeV}$ and $\vert t\vert < 1 {\rm GeV}^2$ . QCD based calculations at next-to-leading order using generalized parton distributions can describe the data, as can colour dipole model predictions.