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The cross section for e^+e^- to pi^+pi^-J/psi between 3.8 and 5.5 GeV/c^2 ismeasured 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 isanother cluster of events at around 4.05 GeV/c^2. A fit using two interferingBreit-Wigner shapes describes the data better than one that uses only theY(4260), especially for the lower mass side of the 4.25 GeV enhancement.

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