Polarized deep inelastic and elastic scattering from gauge/string duality

In this paper, we investigate deep inelastic and elastic scattering on a polarized spin-112 hadron using gauge/string duality. This spin-12 hadron corresponds to a supergravity mode of the dilatino. The polarized deep inelastic structure functions are computed in the supergravity approximation at large t' Hooft coupling lambda and finite x with lambda(-1/2)< x < 1. Furthermore, we discuss the moments of all structure functions, and propose an interesting sum rule 01dxg(2)(x,q(2))=0 for the g(2) structure function which is known as the Burkhardt-Cottingham sum rule in QCD. In the end, the elastic scattering is studied and elastic form factors of the spin-12 hadron are calculated within the same framework.