Speaker: Arshad Momen, PhD, Professor, Department of Physical Sciences, IUB.

Abstract: Lorentz symmetry prevents  the  decay of a massive spin-1 particle into two massless photons, a result known as the Landau-Yang theorem . However,  infrared effects in QED can break Lorentz symmetry spontaneously. Employing  a construction by Mund et. al. which encodes this feature we propose an interaction which leads to $Z^0 \rightarrow 2 \gamma$, violating this theorem.