Observation of a Broad Structure in the π + π − J / ψ Mass Spectrum around 4.26 GeV / c 2
Laboratoire d’Annecy de Physique des Particules · Universitat Autònoma de Barcelona · +85 more institutions
Abstract
We study initial-state radiation events, e+ e- --> gammaISR pi+ pi- J/psi, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of pi+ pi- J/psi. 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.
Citation impact
- FWCI
- 64.46
- Percentile
- 100%
- References
- 14
Authors
635- BAB. AubertCorresponding
Laboratoire d’Annecy de Physique des Particules
- RBR. Barate
Laboratoire d’Annecy de Physique des Particules
- DBD. Boutigny
Laboratoire d’Annecy de Physique des Particules
- FCF. Couderc
Laboratoire d’Annecy de Physique des Particules
- YKY. Karyotakis
Laboratoire d’Annecy de Physique des Particules
Topics & keywords
- Physics
- Resonance (particle physics)
- Particle physics
- Spectral line
- Invariant mass
- Crystallography
- Quantum mechanics
Funding
- NSNational Science Foundation
- UDU.S. Department of Energy
- APAlfred P. Sloan Foundation
- AVAlexander von Humboldt-Stiftung
- DFDeutsche Forschungsgemeinschaft
- BFBundesministerium für Bildung und Forschung
- CNCentre National de la Recherche ScientifiqueAward: CNRS-IN2P3
- NSNatural Sciences and Engineering Research Council of Canada
- IOInstitute of High Energy Physics
- INInstitut National de Physique Nucléaire et de Physique des Particules
- SNSLAC National Accelerator Laboratory