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

$\beta {{}^\prime}/\mathit A$

INSPIRE  
Zero if $\mathit T$ invariance holds.
VALUE ($ 10^{-3} $) EVTS DOCUMENT ID TECN CHG  COMMENT
$\bf{ 2 \pm7}$ OUR AVERAGE
$-0.5$ $\pm7.8$ $\pm1.8$ 30M
DANNEBERG
2005
CNTR + $7 - 53$ MeV ${{\mathit e}^{+}}$
$17$ $\pm17$ $\pm6$ 5.3M 1
BURKARD
1985B
CNTR + 9$-$53 MeV ${{\mathit e}^{+}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$-1.3$ $\pm3.5$ $\pm0.6$ 30M 2
DANNEBERG
2005
CNTR + $7 - 53$ MeV ${{\mathit e}^{+}}$
$1.5$ $\pm6.3$ 3
BURKARD
1985B
FIT
1  Previously we used the global fit result from BURKARD 1985B in OUR AVERAGE, we now only include their actual measurement. BURKARD 1985B measure ${{\mathit e}^{+}}$ polarizations P$_{T_{1}}$ and P$_{T_{2}}$ versus ${{\mathit e}^{+}}$ energy.
2  $\alpha $ = $\alpha {{}^\prime}$ = 0 assumed.
3  Global fit to all measured parameters. The fit correlation coefficients are given in BURKARD 1985B.
Conservation Laws:
TIME REVERSAL ($\mathit T$) INVARIANCE
References:
DANNEBERG 2005
PRL 94 021802 Muon Decay: Measurement of the Transverse Polarization of the Decay Positrons and its Implications for the Fermi Coupling Constant and Time Reversal Invariance
BURKARD 1985B
PL 160B 343 Muon Decay: Measurement of the Transverse Positron Polarization and General Analysis
Also
PR D24 2004 Measurement of the Positron Longitudinal Polarization in Muon Decay
Also
PL 129B 260 Does the Positron from Muon Decay have Transverse Polarization?