Direct extraction of QCD LambdaMSbar from moments of structure functions in neutrino-nucleon scattering, using the CORGI approach

Abstract

We use recently calculated next-to-next-to-leading (NNLO) anomalous dimension coefficients for the n=1,3,5,...,13 moments of the xF3 structure function in nuN scattering, together with the corresponding three-loop Wilson coefficients, to obtain improved QCD predictions for the moments. The Complete Renormalization Group Improvement (CORGI) approach is used, in which all dependence on renormalization or factorization scales is avoided by a complete resummation of ultraviolet logarithms. The Bernstein Polynomial method is used to compare these QCD predictions to the xF3 data of the CCFR collaboration. Direct fits for LambdaMSbar(5), with Nf=5 effective quark flavours, over the range 20<Q^2<125.9 GeV^2 were performed. We obtain LambdaMSbar(5)=202+54/-45 MeV, corresponding to the three-loop running coupling alphas(MZ)=0.1174+0.0043-0.0043. Including target mass corrections as well we obtain LambdaMSbar(5)=228+35/-36 MeV, corresponding to alphas(MZ)=0.1196+0.0027-0.0031.

1 figure, 16 pages, corrected values of alphas(MZ)

References in corpus (1)

• Improved Calculation of F2 in Electroproduction and xF3 in Neutrino Scattering to NNLO and Determination of alpha_s

Cited by in corpus (5)

• Next-to-Leading order approximation of polarized valon and parton distributions
• N^3LO fits to xF_3 data : ${\alpha }_s$ vs 1/Q^2 contributions
• The NNLO non-singlet QCD analysis of parton distributions based on Bernstein polynomials
• Improved analysis of moments of F3 in neutrino-nucleon scattering using the Bernstein polynomial method
• Summary of Working Group 3 of the Neutrino Factory '02 Workshop