Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-11-19
JHEP 0302 (2003) 015
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, LATEX, 4 figures (EPS). Talk given at 16th International Baldin Seminar on High-Energy Physics Problems: Relativistic
Scientific paper
10.1088/1126-6708/2003/02/015
We report the value of $\alpha_{\rm s}$ obtained from QCD analysis of existing data on deep-inelastic scattering of charged leptons off proton and deuterium and estimate its theoretical uncertainties with particular attention paid to impact of the high-twist contribution to the deep-inelastic-scattering structure functions. Taking into account the major uncertainties the value $\alpha^{\rm NNLO}_{\rm s}(M_{\rm Z})=0.1143 \pm 0.0014({\rm exp.})\pm 0.0013({\rm theor.})$ is obtained. An extrapolation of the LO--NLO--NNLO results to the higher orders makes it possible to estimate $\alpha^{\rm N^3LO}_{\rm s}(M_{\rm Z})\sim 0.113$.
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