Diffractive Neutral Pion Production, Chiral Symmetry and the Odderon
classification
✦ hep-ph
keywords
chiraldiffractiveneutralodderonpionsymmetryconsequencediscuss
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We discuss the diffractive photo- and electroproduction of a single neutral pion at high energies where it can occur due to odderon exchange. We show that this process is dynamically suppressed as a consequence of chiral symmetry. Our result reconciles earlier theoretical expectations with the non-observation of this reaction at HERA.
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