Theory

Quark distribution Functions

Polarized

The inclusive double polarization asymmetries [math]A_N[/math] can be written in terms of polarized [math]\triangle q_v (x)[/math] and unpolarized [math]q_v (x)[/math] valence quark distributions,

    [math]A_{1,p}=frac\{4\triangle u_v (x) + \triangle d_v (x)}{3}[/math]