$\gamma \gamma \to {\pi }^0{\pi }^0$ as a test for the existence of a light $\sigma$ meson

J. L. Lucio, G. Moreno, M. Napsuciale +1

We work out predictions of the Linear Sigma Model for the $\gamma \gamma \to {\pi }^0{\pi }^0$ cross section. We consider the sigma width, which is introduced in a consistent way with chiral Ward identi…