Recent Results on Charm Photoproduction

Abstract

Photoproduction of $D_s^{\pm}$ mesons has been measured in the ZEUS detector at HERA and compared with predictions of NLO pQCD calculations. The ratio of $D_s^{*\pm}$ to $D^{*\pm}$ cross sections has been compared to results from $e^{+}e^{-}$ experiments. Orbitally excited P-wave charm mesons have been observed in the $D^{*\pm}\pi^{\mp}$ final state. The fraction of $D^{*\pm}$ 's originating from these mesons has been calculated and compared with that from $e^{+}e^{-}$ interactions. No evidence for radially excited mesons decaying to $D^{*\pm}\pi^{+}\pi^{-}$ was found. The inelastic production of J/$\psi$ mesons has been measured and compared to LO and NLO pQCD predictions.