Abstract
A measurement of elastic deeply virtual Compton scattering γ∗p→γp using e−p collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 145 pb−1. The cross section is measured as a function of the virtuality Q2 of the exchanged photon and the centre-of-mass energy W of the γ∗p system in the kinematic domain 6.5<Q2<80 GeV2, 30<W<140 GeV and |t|<1 GeV2, where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q2 and W values and exponential t-slope parameters are derived. The measurements are compared to a NLO QCD calculation based on generalised parton distributions. In the context of the dipole approach, the geometric scaling property of the DVCS cross section is studied for different values of t.
Highlights
Measurements of inclusive deep-inelastic scattering (DIS) of leptons and nucleons allow the extraction of Parton Distribution Functions (PDFs) which describe the fraction of the longitudinal momentum of the nucleon carried by the quarks, anti-quarks and gluons
The cross section for deeply virtual Compton scattering γ ∗p → γp has been measured with the H1 detector at HERA
The measurement of b(Q2) obtained in the present analysis is used to constrain the normalisation and Q2 dependence of theoretical predictions based on generalised parton distributions (GPDs)
Summary
Supported by the UK Particle Physics and Astronomy Research Council, and formerly by the UK Science and Engineering Research Council. Supported by FNRS-FWO-Vlaanderen, IISN-IIKW and IWT and by Interuniversity Attraction Poles Programme, Belgian Science Policy. Supported by Polish Ministry of Science and Higher Education, grant PBS/DESY/70/2006. Supported by the Swedish Natural Science Research Council. Supported by the Ministry of Education of the Czech Republic under the projects LC527 and INGO-1P05LA259. Supported by the Swiss National Science Foundation. This project is co-funded by the European Social Fund (75%) and National Resources (25%)-(EPEAEK II)-PYTHAGORAS II. Received 26 September 2007; received in revised form November 2007; accepted November 2007
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