https://doi.org/10.1140/epjc/s10052-011-1774-3
Regular Article - Theoretical Physics
Dijet photoproduction of massless charm jets at next-to-leading order of QCD
1
Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, 48149, Münster, Germany
2
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
* e-mail: michael.klasen@uni-muenster.de
Received:
8
July
2011
Revised:
8
September
2011
Published online:
19
October
2011
We compute the charm dijet photoproduction cross section at next-to-leading order of QCD in the zero-mass variable flavour number scheme, i.e. with active charm quarks in the proton and photon. The results are compared to recent measurements from the ZEUS experiment at HERA. The predictions for various distributions agree with the data, in particular for large momentum fractions of the partons in the photon, where direct photon processes dominate. At low momentum fractions, the predictions are quite sensitive to the charm content in the photon. The experimental data are shown to favour parameterizations with a substantial charm-quark density such as the one proposed by Cornet et al.
© Springer-Verlag / Società Italiana di Fisica, 2011
