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

B. Aubert; et al; The BABAR Collaboration

Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/c² in the Reaction e^+e^-toπ^+π^-psi(2S) Measured at BaBar

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arxiv hep-ex/0610057 v2 pith:35XR4T3E submitted 2006-10-18 hep-ex

Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/c² in the Reaction e^+e^-toπ^+π^-psi(2S) Measured at BaBar

The BABAR Collaboration , B. Aubert , et al This is my paper

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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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