${{\boldsymbol \mu}}$ DECAY PARAMETERS

$\beta {{}^\prime}/\boldsymbol A$ INSPIRE search

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