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Search for Odderon-Induced Contributions to Exclusive pi^0 Photoproduction at HERA
High Energy Physics - Experiment · Submitted 28 Jun 2002
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim 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.
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The abstract, sentence by sentence
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 <W> = 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.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | 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 <W> = 215 GeV. | contribution 1.00 | 0.91 | 0.06 | asserted 0.94 |
| s1 | The measurement proceeds via detection of the pi^0 decay photons, a leading neutron from the N^* decay, and the scattered electron. | method 1.00 | 0.92 | 0.02 | asserted 0.99 |
| s2 | 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. | result 1.00 | 0.97 | 0.86 | asserted 1.00 |
| s3 | 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. | interpretation 0.99 | 0.48 | 0.40 | asserted 1.00 |
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The paper
Original 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 <W> = 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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How the literature uses it
5 arXiv papers cite this in 7 sentences
Papers whose main result relates to this one's
States a conflicting result 1 paper
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We show that odderon exchange leads to a much larger inelastic than elastic $\pi^0$ production cross section.
Odderon and photon exchange in pseudoscalar meson production · 0.84
Papers citing it · 5 sentences without a confident label
Contests it 1 paper
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A detailed analysis based on a nonperturbative model of QCD dynamics performed in [ref] led to the prediction [equation] while the subsequent experimental search at HERA [ref] did not find a signal and resulted in the upper bound [equation] Possible causes for the failure of the prediction of [ref] were discussed in [ref] .
Diffractive Neutral Pion Production, Chiral Symmetry and the Odderon · Diffractive neutral pion production as a probe of the odderon · contest 0.86
Cites it as background 1 paper
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Searches for the Odderon in the high energy photoproduction of C-even mesons were performed at HERA at $√(s)≃200$ GeV [ref] .
Searching for the Odderon in Ultraperipheral Proton--Ion Collisions at the LHC · Searching for evidence of Odderon exchange · 0.89
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