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²	LAI 2002B uses the absence of a signal in $K_{L}^{0}$ $\to$ $π^{0} γ γ$ with $m (γ γ) < m (π^{0}$ ) and their $a_{V}$ value to predict this value.

References

ALAVI-HARATI

2004A

PRL 93 021805

Search for the Rare Decay

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

LAI

2002B

PL B536 229

Precise Measurement of the Decay

K_{L}^{0}

\to

π^{0} γ γ

ALAVI-HARATI

2001

PRL 86 397

Search for the Decay

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

ALAVI-HARATI

1999B

PRL 83 917

Measurement of the Decay

K_{L}^{0}

\to

π^{0} γ γ

HARRIS

1993B

PRL 71 3918

Limit on the Branching Ratio of

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

BARKER

1990

PR D41 3546

A New Limit on

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

Also

PRL 61 2661

New Limits on

K_{L}^{0}

K_{S}^{0}

\to

π^{0} e^{+} e^{-}

OHL

1990

PRL 64 2755

Improved Experimental Limit on

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

BARR

1988

PL B214 303

Search for the Decay

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

JASTRZEMBSKI

1988

PRL 61 2300

Limit on

K_{L}^{0}

\to

π^{0} e^{+} e^{-}

and

K_{L}^{0}

\to

e^{+} e^{-}

Category:	Charge conjugation $\times$ Parity ( $C P$ ) or Lepton Family number ( $L F$ ) violating modes, or $Δ S$ = 1 weak neutral current ( $S 1$ ) modes
Note:	(CP) $C P$ INVARIANCE
Note:	(S1) Allowed by higher-order electroweak interactions.
Note:	Allowed by higher-order electroweak interactions.
Note:	Allowed by higher-order electroweak interactions.
Note:	Allowed by higher-order electroweak interactions.

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