Speaker
Description
We extend our theoretical study of the Bjorken sum rule for polarized DIS by building on recent Jefferson Lab data for the nucleon spin structure in the infrared region of small transferred momenta $Q^2<1$ GeV$^2$, where the higher order perturbative corrections and higher-twist contributions play a significant role.
Our theoretical approach is based on the analytic perturbation theory and an original method for matching regions with large and low $Q^2$ values.
By fixing the QCD parameters at large $Q^2$, we move into the region of low $Q^2$, while using the Gerasimov—Drell—Hearn sum rule as a boundary condition.
We investigate the stability of our theoretical predictions and
the agreement between the theoretical description and the experimental data for values of $Q^2$ very close to zero.
