The constraint on the spin dependent structure function g_1 at low Q^2 through the sum rule corresponding to the moment at n=0

The sum rules for the spin dependent structure function g_1^{ab} in the null-plane formalism corresponding to the moment at n=0 has been transformed to the sum rule which relates the g_1^{ab} with the cross section of the isovector photon or the real photon. Based on these sum rules, we argue... Show more