pdgLive

ψ (3770)

\to

Λ \overset{―}{Λ}

Decay Mode Summary INSPIRE PDGID:

M053.42

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


$Γ_{79}$	$ψ (3770)$ $\to$ $Λ \overset{―}{Λ}$	$< 1.2 \times 10^{- 4}$	CL= 90%	1522

Category:

Decays to light hadrons

The following data is related to the above value:

Γ (

ψ (3770)

\to

Λ \overset{―}{Λ}) / Γ_{total}

Γ_{79} / Γ

VALUE

CL%

DOCUMENT ID

TECN

COMMENT

< 1.2 \times 10^{- 4}

HUANG

2006

CLEO

e^{+}

e^{-}

\to

ψ (3770)

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

< 1.8 \times 10^{- 4}

ABLIKIM

2021

BES3

e^{+}

e^{-}

\to

ψ (3770)

< 4 \times 10^{- 4}

ABLIKIM

2007

BES2

e^{+}

e^{-}

\to

ψ (3770)

¹	Using $σ_{t o t}$ ( $e^{+}$ $e^{-}$ $\to$ $ψ (3770)$ ) = $7.9$ $\pm 0.6$ nb at the resonance.

²	From a measurement of the $e^{+}$ $e^{-}$ $\to$ $Λ \overset{―}{Λ}$ cross section between 3.5 and 4.6 GeV. At a 90 $%$ CL the lower bound is $> 2.4 \times 10^{- 6}$ .

³	Assuming that interference effects between resonance and continuum can be neglected and using $σ^{o b s}$ ( $e^{+}$ $e^{-}$ $\to$ $ψ (3770)$ ) = $7.15$ $\pm 0.38$ nb.

References

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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