Abstract
We discuss productions of scalar gluonium candidates in the radiativeJ/ψ decays. The branching ratios of such productions are estimated on the basis of the Euler-Heisenberg effective Lagrangian for gluon-photon couplings. We mention that these estimates cannot be expected to be accurate to better than within a factor 2. We show that the radiativeJ/ψ decays probably invalidate gluoniumgg interpretation of the GAMS meson F0(1590) and a narrow 0++ stateS lying below 1 GeV. However, a possible wide scalar effective gluonium candidateε(920) is shown not to be excluded by the data on the decayJ/ψ→γππ. We also find that the experimental data about radiativeJ/ψ decays presumably agree with a recently suggested interpretation of F0(1590) as being approximately a half-and-half mixture of pure 0++ gluoniumgg andSU(3)f singlet quarkoniumq¯q states.
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Lánik, J., šafaŘík, K. Scalar gluonium candidates and the radiativeJ/ψ decays. Czech J Phys 39, 631–641 (1989). https://doi.org/10.1007/BF01597905
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DOI: https://doi.org/10.1007/BF01597905