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VOLUME 54 (1991) | ISSUE 2 | PAGE 75
How rare are the decays Z→ γ J/Ψ and Z→γΥ (1S)?
The single-loop approximations Z-» γγ* and Z->bb~> γγ* in the standard electroweak model are compared with the approximations of the vector-dominance model, Z-> yJ/Ψ γγ* and Ζ->γΎ( IS) -> γγ*, in the region of real γ rays. A sum rule is found as a result. This rule leads to BR (Ζ^γ3/Ψ) = 10 ~5 and BR (Z^ γΎ( \S)) = 3 X 10 ~5. These figures are two orders of magnitude higher than the values generally expected.