1999/12/23 by Alekhin Sergey
Physics and Astronomy · #hep-ph
published as Phys.Lett. B488 (2000) 187-193 · preprint IHEP-99-55, 10 pages, LATEX, 9 figures (EPS)
arxiv created 1999/12/23 · arxiv updated 2009/11/30
A sensitivity of twist-4 and αs values extracted in the NLO QCD analysis of nonsinglet SLAC-BCDMS-NMC deep inelastic scattering data to the choice of QCD renormalization scale (RS) is analysed. It is obtained that the high twist (HT) contribution to structure function F2, is retuned with the change of RS. This retuning depends on the choice of starting QCD evolution point Q0 and x. At Q0 > 10 GeV2 the HT contribution to F2 is retuned at small x and almost not retuned at large x; at small Q0 it exhibits approximate RS stability for all x in question. The HT contribution to F_ L is RS stable for all Q0 and x. The RS sensitivity of αs also depends on the choice of Q0: at large Q0 this sensitivity is weaker, than at small one. For Q02=9 GeV2 the value αs(MZ)=0.1183±0.0021(stat+syst)±0.0013(RS) is obtained. Connection with the higher order QCD corrections is discussed.