Perturbative stability of the QCD analysis of DIS data

Abstract

We perform pQCD analysis of the existing DIS data for charged leptons with account of corrections up to the NNLO. The parton distributions, value of strong coupling constant, and high-twist terms are extracted and their stability with respect to account of the NNLO corrections is analyzed. All the quantities are generally stable within their experimental errors. Obtained value of the strong coupling constant is ${\alpha }_s^{\mathrm{NNLO}}(M_{\mathrm{Z}})=0.1143\pm 0.0014(\exp )$ with a guess ${\alpha }_s^{\mathrm{NNNLO}}(M_{\mathrm{Z}})\sim 0.113$.

Comments: 4 pages, LATEX, 3 figures (EPS). Talk presented at the 37th Rencontres de Moriond, QCD and Hadronic Interactions, Les Arcs 1800 (France), March 16-23 2002