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Extracting structure functions from physics asymmetries

Extracting $g_1^n$ and $g_2^n$ from raw asymmetries $A_\parallel$ and $A_\perp$:
$\displaystyle g_1(x,Q^2)$ $\textstyle =$ $\displaystyle \frac{F1(x,Q^2)}{D^\prime}\Big[{A_\parallel+\tan(\theta/2)\cdot A_\perp}\Big]$ (13)
$\displaystyle g_2(x,Q^2)$ $\textstyle =$ $\displaystyle \frac{F1(x,Q^2)}{D^\prime}\frac{y}{2\sin\theta} \Big[{\frac{E+E'\cos\theta}{E'}A_\perp-\sin\theta\cdot A_\parallel}\Big]$ (14)


Xiaochao Zheng 2002-05-09