Electron DIS asymmetries

$$A_\parallel = \frac{\sigma{\uparrow\downarrow}-\sigma{\uparrow\uparrow}} {\sigm... ...rac{1-\epsilon}{(1-\epsilon R)W_1} \Big[M(E+E^\prime\cos\theta)G_1-Q^2 G_2\Big]$$ (11)

$$A_\perp = \frac{\sigma{\downarrow\leftarrow}-\sigma{\downarrow\rightarrow}}... ...=\frac{(1-\epsilon)E^\prime}{(1-\epsilon R)W_1} \Big[MG_1+2E G_2\Big]\cos\theta$$ (12)

Scaling: $\frac{\nu}{M}G_1(\nu,Q^2)\rightarrow g_1(x)$, $\frac{\nu^2}{M^2}G_2(\nu,Q^2)\rightarrow g_2(x)$, then