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Measurement of inclusive \(D^{\ast\pm}\) and associated dijet cross sections in photoproduction at HERA

  • The ZEUS Collaboration
  • J. Breitweg et al.
Experimental physics

Abstract.

Inclusive photoproduction of \(D^{\ast\pm}\) mesons has been measured for photon-proton centre-of-mass energies in the range \(130 < W < 280\) GeV and photon virtuality \(Q^2 < \) 1 GeV\(^{2}\). The data sample used corresponds to an integrated luminosity of 37 pb\(^{-1}\). Total and differential cross sections as functions of the \(D^*\) transverse momentum and pseudorapidity are presented in restricted kinematical regions and the data are compared with next-to-leading order (NLO) perturbative QCD calculations using the “massive charm” and “massless charm” schemes. The measured cross sections are generally above the NLO calculations, in particular in the forward (proton) direction. The large data sample also allows the study of dijet production associated with charm. A significant resolved as well as a direct photon component contribute to the cross section. Leading order QCD Monte Carlo calculations indicate that the resolved contribution arises from a significant charm component in the photon. A massive charm NLO parton level calculation yields lower cross sections compared to the measured results in a kinematic region where the resolved photon contribution is significant.

Keywords

Transverse Momentum Differential Cross Section Direct Photon Parton Level Dijet Production 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • The ZEUS Collaboration
  • J. Breitweg et al.
    • 1
  1. 1. Argonne National Laboratory, Argonne, IL, USA US

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