Aubert, B. et al. (2005) Observation of a Broad Structure in the π+π-J/ψ Mass Spectrum around 4.26 GeV/c2. Physical Review Letters, 95 (14). p. 142001. ISSN 0031-9007Metadata only available from this repository.
We study initial-state radiation events, e+e-→γISRπ+π-J/ψ, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of π+π-J/ψ. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.
|Subjects:||Q Science > QC Physics|
|Schools:||School of Applied Sciences|
|Depositing User:||Sharon Beastall|
|Date Deposited:||31 Mar 2011 11:05|
|Last Modified:||31 Mar 2011 11:05|
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