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

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

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

INSPIRE   PDGID:
S013A2
Only the combined value below is put into the Meson Summary Table.
VALUE (%) EVTS DOCUMENT ID TECN
$\bf{ 0.334 \pm0.007 }$ OUR AVERAGE
$0.3322$ $\pm0.0058$ $\pm0.0047$ 298M
ALAVI-HARATI
2002
$0.341$ $\pm0.018$ 34M
GEWENIGER
1974
ASPK
$0.318$ $\pm0.038$ 40M
FITCH
1973
ASPK
$0.346$ $\pm0.033$ 10M
MARX
1970
CNTR
• • We do not use the following data for averages, fits, limits, etc. • •
$0.36$ $\pm0.18$ 600k
ASHFORD
1972
ASPK
$0.246$ $\pm0.059$ 10M 1
SAAL
1969
CNTR
$0.224$ $\pm0.036$ 10M 1
BENNETT
1967
CNTR
1  SAAL 1969 is a reanalysis of BENNETT 1967 .
Conservation Laws:
$\mathit CP$ VIOLATION OBSERVED
References:
ALAVI-HARATI 2002
PRL 88 181601 A Measurement of the ${{\mathit K}_L^0}$ Charge Asymmetry
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
FITCH 1973
PRL 31 1524 ${{\mathit K}_{{e3}}^{0}}$ Charge Asymmetry
Also
Thesis COO-3072-13 Measurement of the Charge Asymmetry in ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit e}^{\mp}}{{\mathit \nu}}$ Decays
ASHFORD 1972
PL 38B 47 Measurement of ${{\mathit K}_L^0}$ $_{e3}$ Charge Asymmetry
MARX 1970
PL 32B 219 Charge Asymmetry in ${{\mathit K}_{{e3}}}$ Decay and Re $\epsilon $
Also
Thesis Nevis 179 A New Measurement of the Leptonic Charge Asymmetry in ${{\mathit K}_{{e3}}}$ Decay
SAAL 1969
Thesis Charge Asymmetry in ${{\mathit K}_{{e3}}}$ Decay
BENNETT 1967
PRL 19 993 Measurement of the Charge Asymmetry in the Decay ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \pi}^{\pm}}{{\mathit e}^{\pm}}{{\mathit \nu}}$