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Search for Odderon Induced Contributions to Exclusive pi-0 Photoproduction at HERA |
| Reference |
N.N., to be published soon!, Summer 2002 |
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| Contact |
Tobias Golling |
| Abstract |
A search for contributions to the reaction ep -> e pi^0 N^star from photon-Odderon fusion in the photoproduction regime at HERA is reported, at an average photon-proton centre-of-mass energy of = 215 GeV. The measurement proceeds via detection of the pi^0 decay photons, a leading neutron from the N^* decay, and the scattered electron. No pi^0 signal is observed and an upper limit on the cross section for the photon-Odderon fusion process of sigma(gamma p -> pi^0 N^star) < 49 nb at 95% CL, integrated over the experimentally accessible range of the squared four-momentum transfer at the nucleon vertex 0.02 < |t| < 0.3 GeV^2, is derived. This excludes a photon-Odderon fusion cross section of 200 nb as predicted by a recent calculation based on a non-perturbative QCD model. |
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