QCD analysis of $x{F}_3$ structure function data and power correction to ${\alpha }_s$

Abstract

Power corrections both to the strong coupling constant and to the structure function itself are estimated on the basis of the LO, NLO and NNLO QCD analysis of $x{F}_3$ structure function data. The sign of correction to the coupling constant is found to be negative. The x-shape of a higher twist contribution to the structure function is stable up to NNLO.

Comments: LaTeX, 6 pages, 1 figure