${{\mathit \mu}}$ DECAY PARAMETERS

$\xi {{}^\prime}$ = LONGITUDINAL POLARIZATION OF ${{\mathit e}^{+}}$

INSPIRE   JSON  (beta) PDGID:
S004PL
($\mathit V−\mathit A$) theory predicts the longitudinal polarization = $\pm1$ for ${{\mathit e}^{\pm}}$, respectively. We have flipped the sign for ${{\mathit e}^{-}}$ so our programs can average.
VALUE EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 1.00 \pm0.04}$ OUR AVERAGE
$0.998$ $\pm0.045$ 1M
BURKARD
1985
CNTR + Bhabha + annihil
$0.89$ $\pm0.28$ 29k
SCHWARTZ
1967
OSPK - Moller scattering
$0.94$ $\pm0.38$
BLOOM
1964
CNTR + Brems. transmiss.
$1.04$ $\pm0.18$
DUCLOS
1964
CNTR + Bhabha scattering
$1.05$ $\pm0.30$
BUHLER
1963
CNTR + Annihilation
References