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.

arXiv comment11 pages, 5 figures, 2 tables; version to appear in PRL

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• Measurement of the near-threshold $e^{+}{e}^{-}\to D^{(\ast )\pm }D{}^{\ast \mp }$ cross section using initial-state radiation
• Psi(2S) -> pi^+ pi^- J/psi Decay Distributions
• Determining the upper limit of Gamma_{ee} for the Y(4260)

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