Global fit to the charged leptons deep-inelastic-scattering data: αs, parton distributions, and high twists
We perform the next-to-leading-order QCD analysis of the world data on inclusive deep-inelastic-scattering cross sections of charged leptons off the proton and deuterium targets. The parton distributions, the value of strong-coupling constant αs, and the twist-4 contributions to the structure functions F2 and FL are extracted with a complete account of the correlations of data points due to the systematic errors. The sensitivity of the αs value and the high-twist contribution to the procedures of accounting for the systematic errors are studied. The impact of theoretical uncertainties on the value of αs and on the parton distributions is analyzed. The obtained value of the strong-coupling constant taking into account these uncertainties is αs(MZ)=0.1165+/-0.0017 (stat+syst)+/-0.00260.0034(theor). The uncertainties of parton-parton luminosities for the Fermilab and CERN LHC colliders are estimated.