Dispersive analysis of the $\mathbf{J}/\mathbf{\psi }\to \mathbf{\gamma }{\mathbf{\pi }}^0{\mathbf{\pi }}^0$ process

Bai-Long Hoid, Igor Danilkin, Anna Testa +1

We present a dispersive amplitude analysis of the low-energy ${\pi }^0{\pi }^0$ system in the radiative decay $J/\psi \to \gamma {\pi }^0{\pi }^0$, using the mass-independent BESIII $0^{++}$ and $2^{++}$ intensi…