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 present a measurement of the cross section of the process $e^{+}{e}^{-}\to {\pi }^{+}p{i}^{-}\psi (2S)$ 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.

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

References in corpus (3)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Charmonium Decays of $Y(4260), psi(4160), and psi(4040)

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