$Z^0$ Decay into Two Photons

Details $Z^0$ Decay into Two Photons $Z^0$ Decay into Two Photons

2011-09-02

arxiv.org/abs/1109.0926v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, no figure

Scientific paper

We calculate the decay rate of the $Z^0 \rightarrow \gamma +\gamma $ process. The vertex of the $\gamma^\mu \gamma_5$ is responsible for the decay of the weak vector boson into two photons, and the decay process becomes free from the Landau-Yang theorem. The calculated branching ratio is found to be $ {\Gamma_{Z^0\rightarrow 2\gamma}/ \Gamma} \simeq 2.4\times 10^{-8} $, in comparison with the present upper limit of the experimental branching ratio $ {\Gamma_{Z^0\rightarrow 2\gamma} / \Gamma} < 5.2 \times 10^{-5}$. This should be measurable by experiment as far as one can observe photons with around 45 GeV.

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