Decoupling of the leading contribution in the discrete BFKL Analysis of High-Precision HERA Data

Abstract

We analyse, in NLO, the physical properties of the discrete eigenvalue solution for the BFKL equation. We show that a set of eigenfunctions with positive eigenvalues, ω, together with a small contribution from a continuum of eigenfunctions with negative ω, provide an excellent description of high-precision HERA F_2 data in the region, x<0.001, Q^2 > 6 GeV^2. The phases of the eigenfunctions can be obtained from a simple parametrisation of the pomeron spectrum, which has a natural motivation within BFKL. The data analysis shows that the first eigenfunction decouples completely or almost completely from the proton. This suggests that there exist an additional ground state, which is naturally saturated and may have the properties of the soft pomeron.

arXiv comment35 pages, 16 figures, the new version gives more explanations of the method and of the results

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• A functional RG approach for the BFKL Pomeron
• The Odderon in QCD with running coupling
• Investigation of High Energy Behaviour of HERA Data
• Two aspects of the Regge limit in QCD: Double Logs in Exclusive observables and Infrared Effects in Cross Sections