Pomeron-Odderon interference effects in electroproduction of two pionsPh. Hägler1, B. Pire2, L. Szymanowski2, 3 and O.V. Teryaev4
1 Universität Regensburg, Institut für Theoretische Physik, 93040 Regensburg, Germany
2 CPhT, École Polytechnique, 91128 Palaiseau, France
3 Soltan Institute for Nuclear Studies, Hoza 69, 00-681 Warsaw, Poland
4 Bogoliubov Laboratory of Theoretical Physics, JINR, 141980 Dubna, Russia
(Received: 18 July 2002 / Published online: 25 October 2002 )
We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a pair. We calculate these asymmetries, originating from both longitudinal and transverse polarizations of the virtual photon, in the framework of QCD and in the Born approximation, in a kinematical domain accessible to HERA experiments. We predict a sizable charge asymmetry with a characteristic dependence on the invariant mass of the pair, which makes this observable very important for establishing the magnitude of the Odderon exchange in hard processes. The single-spin asymmetry turns out to be rather small. We briefly discuss future improvements of our calculations and their possible effects on the results.
© Società Italiana di Fisica, Springer-Verlag 2002