Measurement of e+ e- ---> pi+ pi- J/psi cross-section via initial state radiation at Belle
Collaboration
11 pages
Published in:
- Phys.Rev.Lett. 99 (2007) 182004
e-Print:
- 0707.2541 [hep-ex]
Report number:
- BELLE-PREPRINT-2007-31,
- KEK-PREPRINT-2007-23
Experiments:
View in:
Citations per year
Abstract: (arXiv)
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.Note:
- 11 pages, 5 figures, 2 tables/ version to appear in PRL
- 14.40.Gx
- 13.66.Bc
- 13.25.Gv
- electron-positron interactions
- hadron electroproduction
- pion production
- psi mesons
- Upsilon meson resonances
- electron positron: colliding beams
- electron positron: annihilation
References(19)
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