Coupled-channel Omnès matrix for the $D$-wave isoscalar $\pi \pi /K\bar{K}$ system and its application to $J/\psi \to {\pi }^0{\pi }^0\gamma ,K_S{K}_S\gamma$

Igor Danilkin, Oleksandra Deineka, Emilie Passemar +1

In this work, we construct the $D$-wave isoscalar $\pi \pi /K\bar{K}$ coupled-channel Omnès matrix, formulated to satisfy unitarity, analyticity, and the appropriate asymptotic behavior.…