%0 Journal Article
%T Diffractive Neutral Pion Production, Chiral Symmetry and the Odderon
%A Ewerz
%A Carlo
%A Nachtmann
%A Otto
%J High Energy Physics - Phenomenology
%D 2007
%I 
%X 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.
%U http://arxiv.org/abs/0707.1507