Measurement of inclusive and dijet D∗ meson cross sections in photoproduction at HERA

The inclusive photoproduction of D∗ mesonsand of D ∗-tagged dijets is investigated with the H1 detector at the ep collider HERA. The kinematic region covers small photon virtualities Q 2 1.8 GeV. The heavy quark production process is further investigated in events with at least two jets with transverse momentum p T (jet)>3.5 GeV each, one containing the D∗ meson. Differential cross sections for D ∗-tagged dijet production and for correlations between the jets are measured in the range |η(D ∗)| 2.1 GeV. The results are compared with predictions from Monte Carlo simulations and next-to-leading order perturbative QCDcalculations.