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

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011812
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Submitted on : Tuesday, November 5, 2002 - 10:00:39 AM
Last modification on : Wednesday, April 7, 2021 - 3:26:01 PM

### Citation

C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, et al.. Search for Odderon-Induced Contributions to Exclusive $\pi^0$ Photoproduction at HERA. Physics Letters B, Elsevier, 2002, 544, pp.35-43. ⟨in2p3-00011812⟩

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