$\xi {{}^\prime}$ = LONGITUDINAL POLARIZATION OF ${{\boldsymbol e}^{+}}$
INSPIRE search
($\mathit V−\mathit A$) theory predicts the longitudinal polarization = $\pm1$ for ${{\mathit e}^{\pm}}$, respectively. We have flipped the sign for ${{\mathit e}^{-}}$ so our programs can average.