Contribution of Scalar Loops to the Three-Photon Decay of the Z

Details Contribution of Scalar Loops to the Three-Photon Decay of the Z Contribution of Scalar Loops to the Three-Photon Decay of the Z

1993-06-02

arxiv.org/abs/hep-ph/9306206v2

Phys.Rev. D50 (1994) 602-605

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, plain Tex, 1 figure available under request via fax or mail, OCIP/C-93-5, UQAM-PHE-93/07

Scientific paper

10.1103/PhysRevD.50.602

I corrected 3 mistakes from the first version: that were an omitted Feynman integration in the function f^3_{ij}, a factor of 2 in front of log f^3_{ij} 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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