Observation of a Near-Threshold Enhancement in the e{sup +}e{sup -}{yields}{lambda}{sub c}{sup +}{lambda}{sub c}{sup -} Cross Section Using Initial-State Radiation
Journal Article
·
· Physical Review Letters
- Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
- High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
We report a measurement of the exclusive e{sup +}e{sup -}{yields}{lambda}{sub c}{sup +}{lambda}{sub c}{sup -} cross section as a function of center-of-mass energy near the {lambda}{sub c}{sup +}{lambda}{sub c}{sup -} threshold. A clear peak with a significance of 8.2{sigma} is observed in the {lambda}{sub c}{sup +}{lambda}{sub c}{sup -} invariant mass distribution just above threshold. With an assumption of a resonance origin for the observed peak, a mass and width of M=[4634{sub -7}{sup +8}(stat){sub -8}{sup +5}(syst)] MeV/c{sup 2} and {gamma}{sub tot}=[92{sub -24}{sup +40}(stat){sub -21}{sup +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{sup -1} at the KEKB asymmetric-energy e{sup +}e{sup -} collider.
- OSTI ID:
- 21179842
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
Similar Records
Observation of B{sup +}{yields}p{lambda}{pi}{sup +}{pi}{sup -} at Belle
Study of J/{psi}{yields}pp,{lambda}{lambda} and Observation of {eta}{sub c}{yields}{lambda}{lambda} at Belle
Observation of an enhancement in e{sup +}e{sup -}{yields}{Upsilon}(1S){pi}{sup +}{pi}{sup -}, {Upsilon}(2S){pi}{sup +}{pi}{sup -}, and {Upsilon}(3S){pi}{sup +}{pi}{sup -} production near {radical}(s)=10.89 GeV
Journal Article
·
Mon Nov 30 23:00:00 EST 2009
· Physical Review. D, Particles Fields
·
OSTI ID:21313428
Study of J/{psi}{yields}pp,{lambda}{lambda} and Observation of {eta}{sub c}{yields}{lambda}{lambda} at Belle
Journal Article
·
Fri Oct 20 00:00:00 EDT 2006
· Physical Review Letters
·
OSTI ID:20861012
Observation of an enhancement in e{sup +}e{sup -}{yields}{Upsilon}(1S){pi}{sup +}{pi}{sup -}, {Upsilon}(2S){pi}{sup +}{pi}{sup -}, and {Upsilon}(3S){pi}{sup +}{pi}{sup -} production near {radical}(s)=10.89 GeV
Journal Article
·
Mon Nov 01 00:00:00 EDT 2010
· Physical Review. D, Particles Fields
·
OSTI ID:21503756