pdgLive

J / ψ (1 S)

\to

e^{\pm} τ^{\mp}

Decay Mode Summary INSPIRE PDGID:

M070.178

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


$Γ_{376}$	$J / ψ (1 S)$ $\to$ $e^{\pm} τ^{\mp}$	$< 7.5 \times 10^{- 8}$	CL= 90%	1039

Category:	Charge conjugation ( $C$ ), Parity ( $P$ ), 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 (

J / ψ (1 S)

\to

e^{\pm} τ^{\mp}) / Γ_{total}

Γ_{376} / Γ

VALUE

CL%

DOCUMENT ID

TECN

COMMENT

< 7.5 \times 10^{- 8}

ABLIKIM

2021

BES3

e^{+}

e^{-}

\to

J / ψ

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

< 8.3 \times 10^{- 6}

ABLIKIM

2004

BES

e^{+}

e^{-}

\to

J / ψ

¹	Superseded by ABLIKIM 2021M.

References

ABLIKIM

2021M

PR D103 112007

Search for the charged lepton flavor violating decay

J / ψ \to e τ

ABLIKIM

2004

PL B598 172

Search for the Lepton Flavor Violation Processes

J / ψ

\to

μ τ

and

e τ

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.

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