Differential cross-sections of D*+- photoproduction in e p collisions at HERA

Inclusive photoproduction of \dspm in ep collisions at HERA has been measured with the ZEUS detector for photon-proton centre of mass energies in the range \linebreak \wrang and photon virtuality Q~2 < 4 \g2. The cross section \sigma_{ep \to \ds X} integrated over the kinematic region \ptrangand \etarang is {\xsecs}. Differential cross sections as functions of p_{\perp}~{\ds}, \eta~{\ds} and W are given. The data are compared with two next-to-leading order perturbative QCD predictions. For a calculation using a massive charm scheme the predicted cross sections are smaller than the measured ones. A recent calculation using a massless charm scheme is in agreement with the data.

Note:

18 pages including 4 figures Report-no: DESY-97-026

positron p: colliding beams
positron p: deep inelastic scattering
D*(2010): photoproduction
D*(2010): hadronic decay
channel cross section
differential cross section: transverse momentum
differential cross section: rapidity dependence
energy dependence
quantum chromodynamics: perturbation theory
mass: charm

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