1998/09/23 by A. L. Kataev, G. Parente, Kataev, A. L. +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9809500
LaTeX, 21 pages, 1 figure
arxiv created 1998/09/23 · arxiv updated 2009/11/30
The improved next-to-next-to-leading order (NNLO) QCD analysis of the experimental data of the CCFR collaboration for the xF3 structure function is made. Theoretical ambiguities of the NNLO fits are estimated by means of the Padé resummation technique, which was applied both in the expanded and non-expanded forms. The NNLO and the new N3LO αs(Q2) MS-matching conditions are used. In the process of the fits we are taking into account the target mas corrections and the twist-4 1/Q2-terms. Our NNLO results for αs(MZ) values, extracted from the CCFR xF3 data, are αs(MZ)=0.118 ± 0.002 (stat)± 0.005 (syst) ± 0.003(theory) provided the twist-4 contributions are fixed through the infrared renormalon model and αs(MZ)=0.116+ 0.006-0.007(stat)± 0.005 (syst) ± 0.004(theory) provided the twist-4 terms are considered as the free parameters. It is shown that the extracted at the NNLO order x-shape of the twist-4 correction is almost unchanged after application of the Padé resummation approximant.