Abstract
The spin structure of the nucleon can play a key testing ground for the Quantum Chromo-Dynamics(QCD) at wide kinematic ranges from smaller to large four momentum transfer Q 2. It is far more challenging to understand the QCD at small Q 2 region due to the non-perturbative nature. Jefferson Lab has been one of the major experimental facilities for the spin structure with its polarized electron beams and various polarized targets. A few QCD sum rules have been compared with the measured spin structure functions g 1 and g 2 at low Q 2 and the most surprising results have been obtained for the spin polarizabilities, γ 0 and δ LT .
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Choi, S., Kim, W. Spin Structure of the Nucleon at Low Q 2 Region. Few-Body Syst 54, 135–140 (2013). https://doi.org/10.1007/s00601-012-0371-9
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DOI: https://doi.org/10.1007/s00601-012-0371-9