On the value of αₛ from the analysis of the SLAC/BCDMS deep inelastic scattering data

الأصل · EN

We performed NLO QCD analysis of the nonsinglet part of the combined SLAC/BCDMS data on F₂ with the extraction of αₛ and high twist contribution. It was shown that the value of αₛ obtained in the analysis is sensitive to the statistical inference procedures dealing with systematic errors on the data. The fit with the complete account of point-to-point correlations of the data gave the value of αₛ(MZ)=0.1180±0.0017 (68% C.L.), to be compared with the previously reported value of αₛ(MZ)=0.113±0.003 (99% C.L.). This new value of αₛ is compatible with the LEP measurements and the world average. The high twist contribution being strongly anti-correlated with the value of αₛ became lower than it was previously reported.