F_2 Structure Function and Higher-twist Contributons (Nonsinglet Case)
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We performed the combine fits of SLAC, BCDMS and NMC data at NLO level. The data are fitted very well with different parametrizations of higher twist contributions. The theory-based parametrizations lead to the low values of QCD parameter Λ^{f=4}_{\overfull{MS}} \sim 140 \pm 21 MeV (or α_s(M^2_Z)= 0.103 \pm 0.002).
4 pages, latex. Talk presented at the DIS98 workshop, Brussels, April 1998
4 pages, latex. Talk presented at the DIS98 workshop, Brussels, April 1998