Determining the upper limit of Gamma_{ee} for the Y(4260)

Abstract

By fitting the R values between 3.7 and 5.0 GeV measured by the BES collaboration, the upper limit of the electron width of the newly discovered resonance Y(4260) is determined to be 580 eV at 90% C.L. Together with the BABAR measurement on the product of Gamma_{ee} and BR(Y(4260) --> pi+pi- J/psi), this implies a large decay width of Y(4260) --> pi+pi- J/psi final states.

arXiv comment8 pages, 4 figures

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• Observation of a Broad Structure in the ${\pi }^{+}{\pi }^{-}J/\psi$ Mass Spectrum around 4.26 GeV/$c^2$
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• Suppressed decay into open charm for the Y(4260) being an hybrid
• Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev
• Possible Molecular Structure of the Newly Observed Y(4260)
• Charmonium's K2 peak
• Observation of psi(3770)--> pi pi J/psi and Measurement of Gamma_{ee}[psi(2S)]
• The Y(4260) as an omega chi_{c1} molecular state
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• A New Analysis of the R Measurements: Resonance Parameters of the Higher Vector States of Charmonium

Cited by in corpus (35)

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• Observation of a charged (DD*bar)- mass peak in e+e- --> pi+ (DD*bar)- at Ecm=4.26 GeV
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• Investigating possible decay modes of $Y(4260)$ under the $D_1(2420)\bar{D}+c.c$ molecular state ansatz
• Exclusive Production of $D_s^{+}{D}_s^{-}$, $D_s^{\ast +}{D}_s^{-}$, and $D_s^{\ast +}{D}_s^{\ast -}$ via $e^{+}{e}^{-}$ Annihilation with Initial-State-Radiation
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• Search for the reaction $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\chi }_{cJ}$ and a charmonium-like structure decaying to ${\chi }_{cJ}{\pi }^{\pm }$ between 4.18 and 4.60 GeV
• Hadron and Quarkmonium Exotica