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http://hdl.handle.net/2445/141360
Title: | Observation of a Broad Structure in the π+π−J/ψ Mass Spectrum around 4.26 GeV/c2 |
Author: | Graugés Pous, Eugeni BABAR Collaboration |
Keywords: | Física de partícules Experiments Particle physics Experiments |
Issue Date: | 28-Sep-2005 |
Publisher: | American Physical Society |
Abstract: | 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.95.142001 |
It is part of: | Physical Review Letters, 2005, vol. 95, num. 14, p. 142001 |
URI: | http://hdl.handle.net/2445/141360 |
Related resource: | https://doi.org/10.1103/PhysRevLett.95.142001 |
ISSN: | 0031-9007 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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