Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-04-11
Phys.Atom.Nucl.60:1707-1714,1997; Yad.Fiz.60N10:1866-1873,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented at the Workshop on High Energy Polarization Phenomena, Ringberg, Germany, February 24-28, 1997, to appear in Ph
Scientific paper
The nonperturbative $Q^2$- dependence of the sum rules for the structure functions of polarized $e(\mu)N$ scattering is discussed. The determination of twist-4 corrections to the structure functions at high $Q^2$ by QCD sum rules is reviewed and critically analyzed. It is found that in the case of the Bjorken sum rule the twist-4 correction is small at $Q^2 > 5 GeV^2$ and does not influence the value of $\alpha_s$ determined from this sum rule. However, the accuracy of the today experimental data is insufficient to reliably determine $\alpha_s$ from the Bjorken sum rule. For the singlet sum rule -- $p+n$ -- the QCD sum rule gives only the order of magnitude of twist-4 correction. At low and intermediate $Q^2$ the model is presented which realizes a smooth connection of the Gerasimov-Drell-Hearn sum rules at $Q^2 = 0$ with the sum rules for $\Gamma_{p,n}(Q^2)$ at high $Q^2$. The model is in a good agreement with the experiment.
No associations
LandOfFree
The $Q^2$ Dependence of the Sum Rules for Structure Functions of Polarized $e(μ)N$ Scattering does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The $Q^2$ Dependence of the Sum Rules for Structure Functions of Polarized $e(μ)N$ Scattering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The $Q^2$ Dependence of the Sum Rules for Structure Functions of Polarized $e(μ)N$ Scattering will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-352830