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Lorentz symmetry forbids decays of massive spin-1 particle like the $Z^0$into two massless photons, a result known as the Landau-Yang theorem. But it isknown that infrared effects can break Lorentz invariance. Employing theconstruction of Mund et. al. \cite{MRS} which incorporated this Lorentzviolation, we propose an interaction leading to the decay $Z^0 \rightarrow 2\gamma$ and study the dependence of the decay on the parameter of this Lorentzviolation.

Violation of the Landau-Yang theorem from Infrared Lorentz Symmetry Breaking