Theory

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Inclusive Scattering

W

Semi-Inclusive Scattering

Quark distribution Functions

Unpolarized

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}[/math] = [math]4\triangle u_v (x)[/math] + [math]\triangle d_v (x)[/math]

[math]4 u_v (x)[/math] + [math]d_v (x)[/math]

[math]\frac {\lt math\gt 4\triangle u_v (x)[/math] + [math]\triangle d_v (x)[/math]} {[math]4 u_v (x)[/math] + [math]d_v (x)[/math]} </math>