Higher twists and $α_s(M_Z)$ extractions from the NNLO QCD analysis of the CCFR data for $xF_3$ structure function

Details Higher twists and $α_s(M_Z)$ extractions from the NNLO QCD analysis of the CCFR data for $xF_3$ structure function Higher twists and $α_s(M_Z)$ extractions from the NNLO QCD analysis of the CCFR data for $xF_3$ structure function

1999-05-11

arxiv.org/abs/hep-ph/9905310v3

Nucl.Phys. B573 (2000) 405-433

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages LaTeX, 3 ps figures; minor misprints are eliminated, 2 new referencies are added; accepted for publication in Nucl. P

Scientific paper

10.1016/S0550-3213(99)00760-9

A detailed next-to-next-to-leading 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 by application of the Pad\'e resummation technique and variation of the factorization and renormalization scales. The NNLO and N$^3$LO $\alpha_s(Q^2)$ $\bar{MS}$-matching conditions are used. In the process of the fits we are taking into account of twist-4 $1/Q^2$-terms. We found that the amplitude of the $x$-shape of the twist-4 factor is decreasing in NLO and NNLO, though some remaining twist-4 structure seems to retain in NNLO in the case when statistical uncertainties are taken into account. The question of the stability of these results to the application of the [0/2] Pad\'e resummation technique is considered. Our NNLO results for $\alpha_s(M_Z)$ values, extracted from the CCFR $xF_3$ data, are $\alpha_s(M_Z)=0.118 \pm 0.002 (stat) \pm 0.005 (syst)\pm 0.003 (theory)$ provided the twist-4 contributions are fixed through the infrared renormalon model and $\alpha_s(M_Z)=0.121^{+0.007}_{0.010}(stat)\pm 0.005 (syst) \pm 0.003 (theory)$ provided the twist-4 terms are considered as free parameters.

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