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T: Teilchenphysik
T 408: QCD II
T 408.1: Vortrag
Mittwoch, 12. März 2003, 14:00–14:15, SFO11
Prompt Photon Production at HERA — •rachid lemrani — DESY FH1 Notkestr. 85 22603 Hamburg
Inclusive prompt photons are measured in photoproduction at HERA. Cross sections are presented as a function of transverse energy ETγ and pseudorapidity ηγ for ETγ > 5 GeV and −1 < ηγ < 0.9 in the γ p center of mass energy range 142 < W < 266 GeV. The data were taken with the H1 detector in the years 1996-2000. After selection of prompt photon candidates, a sizable amount of background from π0 mesons remains and the γ signal is extracted using calorimetric shower shape variables. The results are compared to a NLO-QCD calculation and to the PYTHIA event generator.