We study initial-state radiation events, e+e- â†'ÎISRÏ€+Ï€-J/Ï, with data collected with the BABAR detector. We observe an accumulation of events near 4.26GeV/c2 in the invariant-mass spectrum of Ï€+Ï€-J/Ï. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26GeV/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 90MeV/c2, depending on the fit hypothesis. © 2005 The American Physical Society.

Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J.P., et al. (2005). Observation of a broad structure in the n+n-J/ψ mass spectrum around 4.26GeV/c2. PHYSICAL REVIEW LETTERS, 95(14), 1-7 [10.1103/PhysRevLett.95.142001].

Observation of a broad structure in the n+n-J/ψ mass spectrum around 4.26GeV/c2

PATRIGNANI, CLAUDIA;
2005

Abstract

We study initial-state radiation events, e+e- â†'ÎISRÏ€+Ï€-J/Ï, with data collected with the BABAR detector. We observe an accumulation of events near 4.26GeV/c2 in the invariant-mass spectrum of Ï€+Ï€-J/Ï. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26GeV/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 90MeV/c2, depending on the fit hypothesis. © 2005 The American Physical Society.
2005
Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J.P., et al. (2005). Observation of a broad structure in the n+n-J/ψ mass spectrum around 4.26GeV/c2. PHYSICAL REVIEW LETTERS, 95(14), 1-7 [10.1103/PhysRevLett.95.142001].
Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Tisserand, V.; Zghiche, A.; Grauges, E.; Palano, A.; Papp...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/552437
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