https://doi.org/10.1140/epjc/s10052-006-0189-z
Regular Article - Theoretical Physics
The curvature of F2 p(x,Q2) as a probe of the range of validity of perturbative QCD evolutions in the small-x region
1
Institut für Physik, Universität Dortmund, 44221, Dortmund, Germany
2
II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
* e-mail: pisano@mail.desy.de
Received:
5
October
2006
Revised:
17
November
2006
Published online:
24
January
2007
Perturbative NLO and NNLO QCD evolutions of parton distributions are studied, in particular in the (very) small-x region, where they are in very good agreement with all recent precision measurements of F2 p(x,Q2). These predictions turn out to be also rather insensitive to the specific choice of the factorization scheme (MS̄ or DIS). A characteristic feature of perturbative QCD evolutions is a positive curvature of F2 p which increases as x decreases. This perturbatively stable prediction provides a sensitive test of the range of validity of perturbative QCD.
© Springer-Verlag Berlin Heidelberg, 2007