Observation of a Near-Threshold Enhancement in the $e^{+} e^{-} \to Λ_{c}^{+} Λ_{c}^{-}$ Cross Section Using Initial-State Radiation

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24 October 2008

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 101 (17) , 172001
https://doi.org/10.1103/physrevlett.101.172001

Abstract

We report a measurement of the exclusive

e^{+} e^{-} \to Λ_{c}^{+} Λ_{c}^{-}

cross section as a function of center-of-mass energy near the

Λ_{c}^{+} Λ_{c}^{-}

threshold. A clear peak with a significance of

8.2 σ

is observed in the

Λ_{c}^{+} Λ_{c}^{-}

invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of

M = [4634_{- 7}^{+ 8} (stat)_{- 8}^{+ 5} (syst)] MeV / c^{2}

and

Γ_{tot} = [92_{- 24}^{+ 40} (stat)_{- 21}^{+ 10} (syst)] MeV

are determined. The analysis is based on a study of events with initial-state-radiation photons in a data sample collected with the Belle detector at the

Υ (4 S)

resonance and nearby continuum with an integrated luminosity of

695 {fb}^{- 1}

at the KEKB asymmetric-energy

e^{+} e^{-}

collider.

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This publication has 22 references indexed in Scilit:

Observation of the $ψ (4415) \to D {\bar{D}}_{2}^{*} (2460)$ Decay Using Initial-State Radiation
Physical Review Letters, 2008
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Observation of a Near-Threshold Enhancement in thee+e−→Λc+Λc−Cross Section Using Initial-State Radiation

Abstract

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Observation of a Near-Threshold Enhancement in the $e^{+} e^{-} \to Λ_{c}^{+} Λ_{c}^{-}$ Cross Section Using Initial-State Radiation