CHARGE ASYMMETRY IN ${{\mathit K}_{{\ell3}}^{0}}$ DECAYS

Such asymmetry violates $\mathit CP$. It is related to Re($\epsilon $).

$\mathit A_{\mathit L}({{\mathit \mu}}$) = [$\Gamma\mathrm {( {{\mathit \pi}^{-}} {{\mathit \mu}^{+}} {{\mathit \nu}_{{\mu}}} )}$ $−$ $\Gamma\mathrm {( {{\mathit \pi}^{+}} {{\mathit \mu}^{-}} {{\overline{\mathit \nu}}_{{\mu}}} )}$]/SUM

INSPIRE   PDGID:
S013A1
Only the combined value below is put into the Meson Summary Table.
VALUE (%) EVTS DOCUMENT ID TECN
$\bf{ 0.304 \pm0.025 }$ OUR AVERAGE
$0.313$ $\pm0.029$ 15M
GEWENIGER
1974
ASPK
$0.278$ $\pm0.051$ 7.7M
PICCIONI
1972
ASPK
• • We do not use the following data for averages, fits, limits, etc. • •
$0.60$ $\pm0.14$ 4.1M
MCCARTHY
1973
CNTR
$0.57$ $\pm0.17$ 1M 1
PACIOTTI
1969
OSPK
$0.403$ $\pm0.134$ 1M 1
DORFAN
1967
OSPK
1  PACIOTTI 1969 is a reanalysis of DORFAN 1967 and is corrected for ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ range difference in MCCARTHY 1972 .
Conservation Laws:
$\mathit CP$ VIOLATION OBSERVED
References:
GEWENIGER 1974
PL 48B 483 Measurement of the Charge Asymmetry in the Decays ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit e}^{\mp}}{{\mathit \nu}}$ and ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit \mu}^{\mp}}{{\mathit \nu}}$
Also
Thesis CERN Int. 74-4 Measurement of the Charge Asymmetry in the Decay ${{\mathit K}^{0}}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit e}^{\mp}}{{\mathit \nu}}$ as a Function of the ${{\mathit K}^{0}}$ Decay Time
MCCARTHY 1973
PR D7 687 Charge Asymmetry in the Decay ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \mu}}{{\mathit \nu}}$
Also
PL 42B 291 $\mathit CP$ Violating Charge Asymmetry in the Decay ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \mu}}{{\mathit \nu}}$
Also
Thesis LBL-550 Measurement of the Charge Asymmetry in the Decay ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \mu}}{{\mathit \nu}}$
PICCIONI 1972
PRL 29 1412 Measurement of the Charge Asymmetry in the Decay ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit \mu}^{\mp}}{{\mathit \nu}}$
Also
PR D9 2939 Measurement of the Charge Asymmetry in the Decay ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit \mu}}{{\mathit \nu}}$
PACIOTTI 1969
Thesis UCRL 19446 Charge Asymmetry in the Muonic Decay of the ${{\mathit K}_{{2}}^{0}}$
DORFAN 1967
PRL 19 987 Charge Asymmetry in the Muonic Decay of the ${{\mathit K}_{{2}}^{0}}$