Observation of a Broad Structure in the $π^+π^-J/ψ$ Mass Spectrum around 4.26 GeV/$c^2$

Details Observation of a Broad Structure in the $π^+π^-J/ψ$ Mass Spectrum around 4.26 GeV/$c^2$ Observation of a Broad Structure in the $π^+π^-J/ψ$ Mass Spectrum around 4.26 GeV/$c^2$

2005-06-30

arxiv.org/abs/hep-ex/0506081v2

Phys.Rev.Lett.95:142001,2005

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 3 postscript figues, 0 tables submitted to Physics Review Letter

Scientific paper

10.1103/PhysRevLett.95.142001

We study initial-state radiation events, $e^+e^- \to \gamma_{ISR}\pi^+\pi^-J/\psi$, 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 of 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.

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