Study of psi(2S) decays to X J/psi

Abstract

Using J/psi -> mu^+ mu^- decays from a sample of approximately 4 million psi(2S) events collected with the BESI detector, the branching fractions of psi(2S) -> eta J/psi, pi^0 pi^0 J/psi, and anything J/psi normalized to that of psi(2S) -> pi^+ pi^- J/psi are measured. The results are B(psi(2S) -> eta J/psi)/B(psi(2S) -> pi^+ pi^- J/psi) = 0.098 \pm 0.005 \pm 0.010, B(psi(2S) -> pi^0 pi^0 J/psi)/B(psi(2S) -> pi^+ pi^- J/psi) = 0.570 \pm 0.009 \pm 0.026, and B(psi(2S) -> anything J/psi)/B(psi(2S) -> pi^+ pi^- J/psi) = 1.867 \pm 0.026 \pm 0.055.

arXiv comment13 pages, 8 figures

References in corpus (5)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Psi(2S) -> pi^+ pi^- J/psi Decay Distributions
• A possible hadronic excess in psi(2S) decay and rho-pi puzzle
• Ratio of Hadronic Decay Rates of Jψand ψ(2S) and the ρπPuzzle
• Psi(2S) two- and three-body hadronic decays

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• Measurement of the chi_{c2} Polarization in psi(2S) to gamma chi_{c2}
• New Results From CLEO and BES
• Measurement of the branching ratios ${\psi }^{\prime }\to e^{+}{e}^{-}$, ${\psi }^{\prime }\to J/\psi \pi \pi$ and ${\psi }^{\prime }\to J/\psi \eta$
• Recent Results of $\psi (2S)$ Decays from BES
• Charmonium Review