Radiative Higgs decay to $\psi\left(4230\right)$
We calculate the decay rate for the radiative Higgs decay $H \to \psi(4230) + \gamma$ within and beyond the SM. The vector state $\psi(4230)$ is a candidate exotic tetraquark state and has the quantum numbers $I^G(J^{PC})=0^-(1^{--})$, having a mass $m_{\psi(4230)}=4221.7 \pm 2.5$ MeV and a decay width $\Gamma_{\psi(42...