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T: Teilchenphysik

T 401: QCD Theorie I

T 401.1: Talk

Wednesday, March 29, 2006, 16:20–16:40, HG2-HS2

Probing the Perturbative NLO Parton Evolution in the small–x region — •Cristian Pisano¹, M. Glück², and E. Reya² — ¹II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — ²Institut für Physik, Universität Dortmund, 44221 Dortmund, Germany

A dedicated test of the perturbative QCD NLO parton evolution in the very small–x region is performed. We find a good agreement with recent precision HERA–data for F₂^p(x,Q²), as well as with the present determination of the curvature of F₂^p. Characteristically, perturbative QCD evolutions result in a positive curvature which increases as x decreases. Future precision measurements in the very small x–region, x<10⁻⁴, could provide a sensitive test of the range of validity of perturbative QCD.