Abstract
The cross section for e+e-→π+π-J/ψ between 3.8 and 5.5GeV/c2 is measured using a 548fb-1 data sample collected on or near the Υ(4S) resonance with the Belle detector at KEKB. A peak near 4.25GeV/c2, corresponding to the so called Y(4260), is observed. In addition, there is another cluster of events at around 4.05GeV/c2. 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.
| Original language | English |
|---|---|
| Article number | 182004 |
| Journal | Physical Review Letters |
| Volume | 99 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - 2 Nov 2007 |
| Externally published | Yes |
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