The European Physical Journal C

ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)

Table of Contents

Abstract Volume 1 Issue 3/4 (1998) pp 579-583

theoretical physics:
Gluonic mesons in $J/\psi$ radiative decay

Xue-Qian Li (1) (*), Philip R. Page (2) (**)

(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.

(*) On leave from the Department of Physics, Nankai University, Tianjin 300071, P.R. China.
(**) Present address: Theory Group Thomas Jefferson National Accelerator Facility, 12000 Jefferson Avenue, Newport News, VA 23606, USA

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Online publication: February 5, 1998
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