We present a measurement of the cross section of the process e+e-→π+π-ψ(2S) from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the SLAC PEP-II e+e- storage rings. The study is based on 298 fb-1 of data recorded with the BABAR detector. A structure is observed in the cross section not far above threshold, near 4.32 GeV. We also investigate the compatibility of this structure with the Y(4260) previously reported by this experiment.
Evidence of a broad structure at an invariant mass of 4.32 GeV/c2 in the reaction e+ e- -> pi+ pi- Psi(2S) measured at BABAR
BOMBEN, MARCO;BOSISIO, LUCIANO;CARTARO, CONCETTA;DELLA RICCA, GIUSEPPE;DITTONGO, SELENIA;LANCERI, LIVIO;VITALE, LORENZO
2007-01-01
Abstract
We present a measurement of the cross section of the process e+e-→π+π-ψ(2S) from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the SLAC PEP-II e+e- storage rings. The study is based on 298 fb-1 of data recorded with the BABAR detector. A structure is observed in the cross section not far above threshold, near 4.32 GeV. We also investigate the compatibility of this structure with the Y(4260) previously reported by this experiment.File in questo prodotto:
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