# 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

Abstract : We measure the cross section for 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. This structure is not compatible with the Y(4260) previously reported by this experiment. A single resonance is adequate to describe the cross-section in the low-energy region ($<$5.7 GeV).
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00114019
Contributor : Dominique Girod <>
Submitted on : Wednesday, November 15, 2006 - 11:58:13 AM
Last modification on : Wednesday, September 16, 2020 - 4:16:56 PM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. 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. Physical Review Letters, American Physical Society, 2007, 98, pp.212001. ⟨10.1103/PhysRevLett.98.212001⟩. ⟨in2p3-00114019⟩

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