Abstract
The Crystal Ball detector at the e+e− ‐storage ring DORIS‐II has mesaured the γγ‐excitation of resonances decaying into final states with photons only. The results are presented by the partial widths Γγγ as well as by their helicity form factors. Upper limits on candidates for radially excited mesons as well as gluonia are reported and can easily be compared with values of observed resonances using the helicity form factors. Octet‐singlet mixing angles are derived.
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