Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2000-10-19
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 4 figures, Talk given at the PHOTON 2000 Conference, Ambleside, UK, August 26-31,2000
Scientific paper
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.
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