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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/141360
Observation of a Broad Structure in the π+π−J/ψ Mass Spectrum around 4.26 GeV/c2
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We study initial-state radiation events, e + e − → γ ISR π + π − J / ψ , with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV / c 2 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 / c 2 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 / c 2 , depending on the fit hypothesis.
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Observation of a Broad Structure in the π+π−J/ψ Mass Spectrum around 4.26 GeV/c2. Physical Review Letters. 2005. Vol. 95, num. 14, pags. 142001. ISSN 0031-9007. [consulted: 14 of June of 2026]. Available at: https://hdl.handle.net/2445/141360