Hard diffraction and the nature of the Pomeron

Details Hard diffraction and the nature of the Pomeron Hard diffraction and the nature of the Pomeron

2002-10-07

arxiv.org/abs/hep-ph/0210101v1

Nucl.Phys.B649:312-326,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 9 figures

Scientific paper

10.1016/S0550-3213(02)01013-1

We ask the question whether the quark and gluon distributions in the Pomeron obtained from QCD fits to hard diffraction processes at HERA can be dynamically generated from a state made of ``valence-like'' gluons and sea quarks as input. By a method combining backward Q^2-evolution for data exploration and forward Q^2-evolution for a best fit determination, we find that the diffractive structure functions published by the H1 collaboration at HERA can be described by a simple ``valence-like'' input at an initial scale of order mu^2 ~ 2.3-2.7 GeV^2. The parton number sum rules at the initial scale mu^2 for the H1 fit gives 2.1\pm .1\pm .1 and .13\pm .01 \pm .02 for gluon and sea quarks respectively, corresponding to an initial Pomeron state made of (almost) only two gluons. It has flat gluon density leading to a plausible interpretation in terms of a gluonium state.

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