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Particles and Fields
Eur. Phys. J. C 1, 579-583

Gluonic mesons in ${{J/\psi}}$ radiative decay

Xue-Qian Li1 - Philip R. Page2

1 Particle Theory, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK
2 Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK
(e-mail: prp@jlab.org. Tel.: (757) 2695028. Fax.: (757) 2697002)

Received: 7 March 1997

Abstract
Two-gluon coupling of gluonic mesons is estimated in a spectator model to be considerably larger than that of $Q\bar{Q}$.As an example of a gluonic meson that may be produced in ${{J/\psi}}$radiative decay, we analyse $\eta(1760)$. We deduce from experimental data that its branching ratio to two gluons is bounded, $0.4\pm 0.3 \stackrel{<}{\scriptstyle \sim}BR(\eta(1760)\rightarrow gg)\stackrel{<}{\scriptstyle \sim}0.9\pm 0.3$,consistent with a gluonic meson, but not compelling it. We propose further tests, and estimate the two-photon coupling of $\eta(1760)$ to be $1.4\pm 0.7$ keV.


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