Abstract
A search for contributions to the reaction ep→eπ0N∗ from photon–odderon fusion in the photoproduction regime at HERA is reported, at an average photon–proton centre-of-mass energy 〈W〉=215 GeV. The measurement proceeds via detection of the π0 decay photons, a leading neutron from the N∗ decay, and the scattered electron. No π0 signal is observed and an upper limit on the cross section for the photon–odderon fusion process of σ(γp→π0N∗)<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 GeV2. 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.
Highlights
Despite the many successes of quantum-chromodynamics (QCD) in describing hard strong interactions, the bulk of hadronic cross sections remain relatively poorly understood
The analysis presented here is based on data taken with the H1 detector [8] at HERA in 1999 and 2000 where electrons with an energy of 27.5 GeV collided with protons of 920 GeV energy
The OPIUM generator is derived from DIFFVM [21], which was originally designed to simulate exclusive vector mesons produced by pomeron exchange
Summary
Supported by the Swedish Natural Science Research Council. Supported by the Swiss National Science Foundation.
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