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T: Teilchenphysik

T 503: Diffraktion

T 503.2: Talk

Thursday, March 21, 2002, 16:30–16:45, HS 10

Pomeron- and Odderon Induced Photoproduction of Mesons Decaying to Pure Multiphoton Final States at HERA — •Christoph von Cube, Thomas Berndt, Tobias Golling, Karlheinz Meier, Oliver Nix, and Jürgen Stiewe — KIP, Schröderstr. 90, 69120 Heidelberg

Cross section measurements made at HERA for the reactions γ p→ω p and γ p→ ω π⁰ X, and on searches for the reactions γ p→ π⁰ N^*, γ p→ f₂(1270) X, and γ p→ a₂⁰(1320) X, where N^∗ denotes an excited nucleon state, are presented. The mean γ p centre-of-mass energy was ⟨ W ⟩ = 200 GeV (215 GeV for the reaction γ p→π⁰ N^*). Cross sections for the Pomeron-mediated reactions were determined in agreement with previous measurements and phenomenological expectations. In contrast, Odderon induced processes have not been observed; upper limits on cross sections are below predictions from a non-perturbative QCD model.