We study initial-state radiation events, e+e-→γISRπ+π-J/ψ, with data collected with the BABAR detector. We observe an accumulation of events near 4.26  GeV/c2 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/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.

Observation of a Broad Structure in the pi+ pi- J/psi Mass Spectrum around 4.26 GeV/c2 / Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J., Qi, N., Rong, G., Wang, P., Zhu, Y., Eigen, G., Ofte, I., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 95:(2005), pp. 142001-1-142001-7. [10.1103/PhysRevLett.95.142001]

Observation of a Broad Structure in the pi+ pi- J/psi Mass Spectrum around 4.26 GeV/c2

DE NARDO, GUGLIELMO;L. Lista;SCIACCA, CRISOSTOMO;
2005

Abstract

We study initial-state radiation events, e+e-→γISRπ+π-J/ψ, with data collected with the BABAR detector. We observe an accumulation of events near 4.26  GeV/c2 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/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.
2005
Observation of a Broad Structure in the pi+ pi- J/psi Mass Spectrum around 4.26 GeV/c2 / Aubert, B., Barate, R., Boutigny, D., Couderc, F., Karyotakis, Y., Lees, J., Poireau, V., Tisserand, V., Zghiche, A., Grauges, E., Palano, A., Pappagallo, M., Pompili, A., Chen, J., Qi, N., Rong, G., Wang, P., Zhu, Y., Eigen, G., Ofte, I., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 95:(2005), pp. 142001-1-142001-7. [10.1103/PhysRevLett.95.142001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/420061
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