Proton and Neutron Polarized Structure Functions from Low to High Q2

Phenomenological parameterizations of proton and neutron polarized structure functions, g_1^p and g_1ⁿ , are developed for x ≳ 0.02 using deep inelastic data up to 50 (GeV/c)² as well as available experimental results on photo- and electro-production of nucleon resonances. The generalized Drell-Hearn-Gerasimov sum rules are predicted from low to high values of Q² and compared with proton and neutron data. Furthermore, the main results of the power correction analysis carried out on the Q²-behavior of the polarized proton Nachtmann moments, evaluated using our parameterization of g_1^p , are briefly summarized.