Amplitude analysis of $B^0\to J/\psi K^+\pi^-$ and of $B^0\to\psi(2S) K^+\pi^-$ decays

Amplitude analysis of $B^0\to J/\psi K^+\pi^-$ and of $B^0\to \psi(2S) K^+\pi^-$ decays is performed to probe for exotic hadron contributions, like the previously reported $Z_c(4430)^-\to\psi(2S)\pi^-$ and $Z_c(4200)^-\to J/\psi \pi^-$. The data were obtained with the LHCb detector, and corresponds to 9 fb$^{-1}$ of the integrated luminosity in $pp$ collisions at the LHC.