Aubert, B;
Barate, R;
Boutigny, D;
Couderc, F;
Karyotakis, Y;
Lees, JP;
Poireau, V;
... BaBar Collaboration; + view all
(2005)
Observation of a broad structure in the pi(+)pi(-)J/psi mass spectrum around 4.26 GeV/c(2).
PHYS REV LETT
, 95
(14)
, Article 142001. 10.1103/PhysRevLett.95.142001.
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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/c(2) 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/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.
| Type: | Article |
|---|---|
| Title: | Observation of a broad structure in the pi(+)pi(-)J/psi mass spectrum around 4.26 GeV/c(2) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.95.142001 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.95.142001 |
| Language: | English |
| Additional information: | © 2005 The American Physical Society |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1303735 |
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