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arXiv · hep-ex/0610057

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

The BABAR Collaboration·B. Aubert
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Abstract

We present a measurement of the cross section of the process $e^+e^-\toπ^+pi^-ψ(2S)$ 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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The BABAR Collaboration, B. Aubert. 2007-06-07. 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. https://doi.org/10.1103/physrevlett.98.212001

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