Search for Odderon-Induced Contributions to Exclusive pi^0 Photoproduction at HERA

Details Search for Odderon-Induced Contributions to Exclusive pi^0 Photoproduction at HERA Search for Odderon-Induced Contributions to Exclusive pi^0 Photoproduction at HERA

2002-06-28

arxiv.org/abs/hep-ex/0206073v1

Phys.Lett.B544:35-43,2002

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 1 table and 4 figures

Scientific paper

10.1016/S0370-2693(02)02479-6

A search for contributions to the reaction ep-> e pi^0 N^* from photon-Odderon fusion in the photoproduction regime at HERA is reported, at an average photon-proton centre-of-mass energy = 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^*) < 49 nb at the 95% confidence level is derived, integrated over the experimentally accessible range of the squared four-momentum transfer at the nucleon vertex 0.02 < |t| < 0.3 Gev^2. This excludes a recent prediction from a calculation based on a non-perturbative QCD model of a photon-Odderon fusion cross section above 200 nb.

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