Nucleon Spin Structure. Sum Rules

Abstract

Contents: 1. The sum rules or $Γ_{p,n}$.Theoretical status. 2. Calculations of matrix elements over the polarized nucleon by the QCD sum rule approach. 3. Twist-4 corrections to $Γ_{p,n}$ from QCD sum rules. 4. Gerasimov, Drell-Hearn (GDH) sum rules. The estimate of higher twist corrections to $Γ_{p,n}$ using interpolation between $Γ_{p,n}$ and GDH sum rules. 5. Comparison with experiment. 6. The calculations of polarized structure functions by the QCD sum rule method. 7. Calculation of the chirality violating structure function $h_1(x)$ by QCD sum rules. 8. Conclusions.