CINECA IRIS Institutional Research Information System
IRIS è la soluzione IT che facilita la raccolta e la gestione dei dati relativi alle attività e ai prodotti della ricerca. Fornisce a ricercatori, amministratori e valutatori gli strumenti per monitorare i risultati della ricerca, aumentarne la visibilità e allocare in modo efficace le risorse disponibili.
EnglishWe study initial-state radiation events, e+e- -> gamma_ISR 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.
http://hdl.handle.net/11563/16547| Titolo: | Observation of a broad structure in the pi+ pi- J/Psi mass spectrum around 4.26 GeV/c2 |
| Autori interni: | CAVALLO, Nicola FABOZZI, FRANCESCO |
| Data di pubblicazione: | 2005 |
| Rivista: | PHYSICAL REVIEW LETTERS |
| Abstract: | We study initial-state radiation events, e+e- -> gamma_ISR 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. |
| Handle: | http://hdl.handle.net/11563/16547 |
| Appare nelle tipologie: | 1.1 Articolo su Rivista |
File in questo prodotto:
Copyright © 2017