Diffractive parton distributions from perturbative QCD
Institute for Particle Physics Phenomenology, University of Durham, DH1 3LE, UK
2 Petersburg Nuclear Physics Institute, 188300, Gatchina, St. Petersburg, Russia
3 Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany
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The asymptotic collinear factorisation theorem, which holds for diffractive deep-inelastic scattering, has important modifications in the sub-asymptotic HERA regime. We use perturbative QCD to quantify these modifications. The diffractive parton distributions are shown to satisfy an inhomogeneous evolution equation. We emphasise that it is necessary to include both the gluonic and sea-quark t-channel components of the perturbative pomeron. The corresponding pomeron-to-parton splitting functions are derived in the appendix.
© Springer-Verlag, 2005