| Autor: |
S.I. Alekhin |
| Rok vydání: |
2000 |
| Předmět: |
|
| Zdroj: |
Physics Letters B. 488:187-193 |
| ISSN: |
0370-2693 |
| DOI: |
10.1016/s0370-2693(00)00865-0 |
| Popis: |
A sensitivity of twist-4 and α s values extracted in the NLO QCD analysis of non-singlet SLAC-BCDMS-NMC deep inelastic scattering data to the choice of QCD renormalization scale (RS) is analyzed. It is obtained that the high twist (HT) contribution to structure function F 2 , is re-tuned with the change of RS. This re-tuning depends on the choice of starting QCD evolution point Q 0 and x . At Q 0 ≳10 GeV 2 the HT contribution to F 2 is re-tuned significantly at small x and weakly at large x ; at small Q 0 the it exhibits approximate RS stability for all x in question. The HT contribution to F L is RS stable for all Q 0 and x . The RS sensitivity of α s obtained in the analysis 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 α s M Z =0.1183±0.0021( stat+syst )±0.0013( RS ) is obtained. Explanation of those effects based on the analysis of the QCD evolution equations properties is given and connection with the higher order QCD corrections is discussed. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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