期刊
PHYSICAL REVIEW LETTERS
卷 101, 期 17, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.172001
关键词
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资金
- MEXTand JSPS (Japan)
- ARC and DEST (Australia)
- NSFC (China)
- DST (India)
- MOEHRD, KOSEF and KRF (Korea)
- KBN (Poland)
- MES and RFAAE (Russia)
- ARRS (Slovenia)
- SNSF (Switzerland)
- NSC and MOE (Taiwan)
- DOE (USA)
- KEKB
- KEK
- NII
We report a measurement of the exclusive e(+) e(-) -> Lambda(+)(c)Lambda(-)(c) cross section as a function of center-of-mass energy near the Lambda(+)(c)Lambda(-)(c) threshold. A clear peak with a significance of 8.2 sigma is observed in the Lambda(+)(c)Lambda(-)(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 Gamma(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 Upsilon(4S) resonance and nearby continuum with an integrated luminosity of 695 fb(-1) at the KEKB asymmetric-energy e(+)e(-) collider.
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