pdgLive

μ^{-}

\to

e^{-} e^{+} e^{-}

Decay Mode Summary INSPIRE PDGID:

	Mode ^()*		Fraction ( $Γ_{i}$ / $Γ$ )	Scale Factor/ Conf. Level	P(MeV/c)


$Γ_{6}$	$μ^{-}$ $\to$ $e^{-} e^{+} e^{-}$		$< 1.0 \times 10^{- 12}$	CL= 90%	53

Category:	Lepton Family number ( $L F$ ) violating modes
Note:	(LF) Lepton family number conservation means separate conservation of each of $L_{e}$ , $L_{μ}$ , $L_{τ}$ .

The following data is related to the above value:

Γ (

μ^{-}

\to

e^{-} e^{+} e^{-}) / Γ_{total}

Γ_{6} / Γ

Forbidden by lepton family number conservation.

VALUE (

10^{- 12}

)

CL%

DOCUMENT ID

TECN

CHG

COMMENT

< 1.0

90

SPEC

+

SINDRUM

• • We do not use the following data for averages, fits, limits, etc. • •

< 36

90

SPEC

+

ARES

< 35

90

CBOX

+

LAMPF

< 2.4

90

SPEC

+

SINDRUM

< 160

90

SPEC

+

SINDRUM

< 130

90

CNTR

LAMPF

¹	These experiments assume a constant matrix element.

SJNP 53 802

Search for

μ^{+}

\to

e^{+} e^{+} e^{-}

Decay

NP B299 1

Search for the Decay

μ^{+}

\to

e^{+} e^{+} e^{-}

PR D38 2077

Search for Rare Muon Decays with the Crystal Box Detector

PRL 56 2461

Search for the Decay

μ^{+}

\to

e^{+} γ

PRL 57 3241

Search for the Rare Decay

μ^{+}

\to

e^{+} γ γ

NP B260 1

Search for the Decay

μ^{+}

\to

e^{+} e^{+} e^{-}

PL 140B 299

New Upper Limit for the Decay

μ^{+}

\to

e^{+} e^{+} e^{-}

PRL 53 1415

Search for the Muon Number Nonconserving Decay

μ^{-}

\to

e^{+} e^{-} e^{-}

Except where otherwise noted, content of the 2024 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2024. See LBNL disclaimers.