The NNLO QCD analysis of the CCFR data for xF_3: is there still the room for the twist-4 terms?

Abstract

The results of the more detailed NNLO QCD analysis of the CCFR data for $x{F}_3$ SF are presented. The factorization scale uncertainties are analysed. The NNLO results for $alph{a}_s(M_Z)$ and twist-4 contributions are obtained. Despite the fact that the amplitude of the $x$-shape of the twist-4 factor is consequently decreasing at the NLO and NNLO, our new QCD analysis seems to reveal the remaining twist-4 structure at the NNLO level. The definite N${}^3$LO uncertainties are fixed using the [0/2] Padé resummation technique.

Comments: LaTeX, 3 pages, 1 figure; to be published in the Proceedings of DIS99 Workshop, Zeuthen, April 19-23; some technical shortcomings are fixed in the file, 2 referencies corrected