Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^+e^-\toπ^+π^-ψ(2S)$ Measured at BaBar

Details Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^+e^-\toπ^+π^-ψ(2S)$ Measured at BaBar Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^+e^-\toπ^+π^-ψ(2S)$ Measured at BaBar

2006-10-18

arxiv.org/abs/hep-ex/0610057v2

Phys.Rev.Lett.98:212001,2007

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 5 figures, 1 table, to be submitted to PRL

Scientific paper

10.1103/PhysRevLett.98.212001

We present a measurement of the cross section of the process $e^+e^-\to\pi^+pi^-\psi(2S)$ from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the 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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