DOI 10.1007/s100529900219
Spin dependence of deep inelastic diffraction
J. Bartels1 - T. Gehrmann2 - M.G. Ryskin3
1 II. Institut für Theoretische Physik, Universität Hamburg,
22761 Hamburg, Germany
2 Institut für Theoretische Teilchenphysik,
Universität Karlsruhe, 76128 Karlsruhe, Germany
3 Petersburg Nuclear Physics Institute, 188350 Gatchina, St. Petersburg, Russia
Received: 7 July 1999 / Published online: 14 October 1999
Abstract
Using a perturbative model for diffractive interactions, we derive
an expression for
the polarized diffractive structure function g1D in the high energy
limit. This structure function is given by the
interference of diffractive amplitudes with polarized and unpolarized
exchanges. For the polarized exchange we consider both
two-gluon and quark-antiquark amplitudes.
The polarized diffractive amplitude receives sizable
contributions from non-strongly ordered regions in phase space,
resulting in a double logarithmic enhancement at small x. The
resummation of these double logarithmic terms is outlined. We also discuss the
transition from our perturbative expression to the
nonperturbative region.
A first numerical estimate indicates that the perturbative contribution
to the spin asymmetry is substantially larger than the nonperturbative one.
Copyright Springer-Verlag
