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Chiral symmetry and diffractive neutral pion photo- and electroproduction

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Abstract

We show that diffractive production of a single neutral pion in photon-induced reactions at high energy is dynamically suppressed due to the approximate chiral symmetry of QCD. These reactions have been proposed as a test of the odderon-exchange mechanism. We show that the odderon contribution to the amplitude for such reactions vanishes exactly in the chiral limit. This result is obtained in a nonperturbative framework and by using PCAC relations between the amplitudes for neutral pion and axial vector current production.

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Authors and Affiliations

  1. ECT*, Strada delle Tabarelle 286, 38050, Villazzano (Trento), Italy

    C. Ewerz

  2. Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany

    O. Nachtmann

Authors
  1. C. Ewerz
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  2. O. Nachtmann
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Correspondence to C. Ewerz.

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Ewerz, C., Nachtmann, O. Chiral symmetry and diffractive neutral pion photo- and electroproduction. Eur. Phys. J. C 49, 685–696 (2007). https://doi.org/10.1140/epjc/s10052-006-0082-9

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  • DOI: https://doi.org/10.1140/epjc/s10052-006-0082-9

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