Contribution of Scalar Loops to the Three-Photon Decay of the Z
Heinz König
Abstract
I corrected 3 mistakes from the first version: that were an omitted Feynman integration in the function f3ij, a factor of 2 in front of log f3ij in eq.2 and an overall factor of 2 in Fig.1 c). The final result is changed drastically. Doing an expansion in the Higgs mass I show that the matrix element is identically 0 in the order (MZ/MH)2, which is due to gauge invariance. Left with an amplitude of the order (MZ/MH)4 the final result is that the scalar contribution to this decay rate is several orders of magnitude smaller than those of the W boson and fermions.
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