H1prelim-01-117

Investigation of Pomeron- and Odderon Induced Photoproduction of Mesons Decaying to Pure Multiphoton Final States at HERA

Reference T Golling, talks presented at DIS 2001 and EPS 2001, July 2001
Document Conference paper
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Contact Tobias Golling, Karlheinz Meier
Abstract This paper reports on cross section measurements made at HERA for the reactions gamma p -> omega p and gamma p-> omega pi^0 X, and on searches for the reactions gamma p -> pi^0 N^*, gamma p -> f_2(1270) X, and gamma p -> a_2^0(1320) X, where N^* denotes an excited nucleon state. The average photon - proton centre-of-mass energy at HERA were = 200 GeV and 210 GeV. Cross sections for the Pomeron - mediated reactions were determined in agreement with previous measurements and theoretical expectations. Processes mediated by Odderon - photon fusion could not be observed; upper limits on cross sections are below predictions from non-perturbative QCD models.
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