Higher twists and αs(MZ) extractions from the NNLO QCD analysis of the CCFR data for the xF3 structure function

A detailed next-to-next-to-lcading order (NNLO) QCD analysis is performed for the experimental data of the CCFR collaboration for the xF(3) structure function. Theoretical ambiguities of the results of our. NNLO fits are estimated hy application of the Fade resummation technique and variation of the factorization and renormalization scales. The NNLO and (NLO)-L-3 alpha(s)(Q(2)) (M) over bar (S) over bar-matching conditions are used. In the process of the Bts we are taking account of twist-4 1/Q(2)-terms. We round that the amplitude of the x-shape of the twist-4 factor is decreasing in NLO and NNLO, though some remaining twist-4tructure seems to retain in NNLO in the case when only statistical uncertainties are taken into account. The question of the stability of these results to the application of the [0/2] Pade resummation technique is considered. Our NNLO results for alpha(s)(M-L) values, extracted from the CCFR xF(3) data, are alpha(s)(M-Z) = 0.118 +/- 0.002(stat) +/- 0.005(syst) +/- 0.003(theory) provided the twist-4 contributions are fixed through the infrared renormalon model and alpha(s)(M-Z)= 0.121(-0.010)(+0.007) (stat) +/- 0.005(syst) +/- 0.003(theory) provided the twist-4 terms are considered as free parameters. (C) 2000 Elsevier Science B.V. All rights reserved.