Determination of the strong coupling constant using available experimental data

We determine the strong coupling constant αs up to 4-loop in perturbative QCD.Testing QCD requires the measurement of αs over ranges of energy scales.In this analysis,the value of αs is determined from the unpolarized structure functions data points by minimizing the x2 function between the theory result and experimental data.Using perturbative QCD calculations from threshold corrections,we obtain αs(M2Z)=0.1139±0.0020 at N3LO which is in good agreement with the very recently results from the inclusive jet cross section in p(p)collisions at (√s)=1.96 TeV.