We present a measurement of the cross section of the process e_e_ ! ____ _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/c**2 in the reaction e+ e- ---> pi+ pi- psi(2S) measured at BaBar

CAVALLO, Nicola;FABOZZI, FRANCESCO;
2007

Abstract

We present a measurement of the cross section of the process e_e_ ! ____ _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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/17679
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