Measurement of e^+e^- to pi^+pi^-J/psi Cross Section via Initial State Radiation at Belle

Abstract

The cross section for e^+e^- to pi^+pi^-J/psi between 3.8 and 5.5 GeV/c^2 is measured using a 548 fb^{-1} data sample collected on or near the Upsilon(4S) resonance with the Belle detector at KEKB. A peak near 4.25 GeV/c^2, corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05 GeV/c^2. A fit using two interfering Breit-Wigner shapes describes the data better than one that uses only the Y(4260), especially for the lower mass side of the 4.25 GeV enhancement.

11 pages, 5 figures, 2 tables; version to appear in PRL

Cited by in corpus (17)

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• Evidence that the Y(4660) is a f_0(980)psi' bound state
• Observation of $\psi (4415)\to D\bar{D}{}_2^{\ast }(2460)$ decay using initial-state radiation
• Scalar Resonance Contributions to the Dipion Transition Rates of ${\rm Y}(4S,5S)$ in the re-scattering model
• A Uniform Description of the States Recently Observed at B-factories
• Observation of e+e- to K+K-J/psi via Initial State Radiation at Belle
• Combined fit to BaBar and Belle data on e+e- to pi+pi- psi(2S)
• An Estimate of the Partial Width for X(3872) into p p-bar
• The spectrum of charmonium in the Resonance-Spectrum Expansion
• Exotic c c-bar Mesons
• Cross sections of e+e- --> gamma VV and e+e- --> gamma gamma V
• Hadronic Physics
• Searches for, and Properties of, New Charmonium-like States
• New developments in PHOKHARA Monte Carlo generator