Charge and Spin Asymmetries from Pomeron-Odderon Interference
  We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a $\pi^+ \pi^-$ pair. We calculate these asymmetries in the Born approximation of QCD in a kinematical domain accessible to HERA experiments. 
P. Hagler, B. Pire, L. Szymanowski, O.V. Teryaev