Aachen T 2003 – scientific programme

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T: Teilchenphysik

T 408: QCD II

T 408.1: Talk

Wednesday, March 12, 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 E_T^γ and pseudorapidity η^γ for E_T^γ > 5 GeV and −1 < η^γ < 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.