A study of QCD coupling constant from fixed target deep inelastic measurements
Krivokhijine, V. G. · Kotikov, A. V.
Original · EN
We reanalyze deep inelastic scattering data of BCDMS Collaboration by including proper cuts of ranges with large systematic errors. We perform also the fits of high statistic deep inelastic scattering data of BCDMS, SLAC, NM and BFP Collaborations taking the data separately and in combined way and find good agreement between these analyses. We extract the values of the QCD coupling constant αₛ(M²Z) up to NLO level. The fits of the combined data for the nonsinglet part of the structure function F₂ predict the coupling constant value αₛ(M²Z) = 0.1174 ± 0.0007 (stat) ± 0.0019 (syst) ± 0.0010 (normalization). The fits of the combined data for both: the nonsinglet part of F₂ and the singlet one, lead to the values αₛ(M²Z) = 0.1177 ± 0.0007 (stat) ± 0.0021 (syst) ± 0.0009 (normalization). Both above values are in very good agreement with each other.
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