Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-11-29
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 6 figures. To appear in the proceedings of the Ringberg Workshop on "New Trends in HERA Physics 2005", Ringberg Cast
Scientific paper
We discuss the perturbative QCD description of diffractive deep-inelastic scattering, and extract diffractive parton distributions from recent HERA data. The asymptotic collinear factorisation theorem has important modifications in the sub-asymptotic HERA regime. In addition to the usual resolved Pomeron contribution, the direct interaction of the Pomeron must also be accounted for. The diffractive parton distributions are shown to satisfy an inhomogeneous evolution equation, analogous to the parton distributions of the photon.
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