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IHEP 98 - 55
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| S.I.Alekhin | ||
| The QCD renormalization scale stability of high twists and alpha-s in deep inelastic scattering | ||
| Protvino, 1999.-p.9, figs.9, refs.:10. | ||
A sensitivity of twist-4 and $\alpha_{\rm s}$ 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 $F_2$, is retuned with the change of RS. This retuning depends on the choice of starting QCD evolution point $Q_0$ and $x$. At $Q_0\gtrsim 10$~GeV$^2$ the HT contribution to $F_2$ is retuned at small $x$ and is not almost retuned at large $x$; at small $Q_0$ it exhibits approximate RS stability for all $x$ in question. The HT contribution to $F_{\rm L}$ is RS stable for all $Q_0$ and $x$. The RS sensitivity of $\alpha_{\rm s}$ also depends on the choice of $Q_0$: At large $Q_0$ this sensitivity is weaker than at small ones. For $Q_0^2=9$~GeV$^2$ the value $\alpha_{\rm s}\left(M_{\rm Z}\right)=0.1183\pm0.0021({\rm stat+syst})\pm0.0013({\rm RS})$ is obtained. Connection with the higher order QCD corrections is discussed.
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