2022 Impact factor 4.4
Particles and Fields
Eur. Phys. J. C 26, 261-270 (2002)
DOI: 10.1140/epjc/s2002-01054-9

Pomeron-Odderon interference effects in electroproduction of two pions

Ph. 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 $^\ast$
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 $\pi^+ \pi^-$ 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 $\pi^+ \pi^-$ 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