Global fit to the charged leptons DIS data: \boldmath{$α_{\rm s}$,} parton distributions, and high twists

Abstract

We perform the NLO QCD analysis of the world data on inclusive deep inelastic scattering cross sections of charged leptons off the proton and the deuterium targets. The parton distributions, the value of strong coupling constant $α_{\rm s}$, and the twist 4 contributions to the structure functions $F_2$ and $F_{\rm L}$ are extracted with the complete account for the correlations of data points due to the systematic errors. Sensitivity of the $α_{\rm s}$ value and the high twist contribution to the procedures of accounting for the systematic errors is studied. The impact of theoretical uncertainties on the value of $α_{\rm s}$ and on the parton distributions is analysed. The obtained value of strong coupling constant with the account of these uncertainties is $α_{\rm s}(M_{\rm Z})=0.1165\pm0.0017({\rm stat+syst}) \pm^{0.0026}_{0.0034}({\rm theor})$. The uncertainties of parton-parton luminosities for the FNAL and LHC colliders are estimated.