A New Look at the $Y$ Tetraquarks and $\Omega_c$ Baryons in the Diquark Model

We analyze the hidden charm $P$-wave tetraquarks in the diquark model, using an effective Hamiltonian incorporating the dominant spin-spin, spin-orbit and tensor interactions, comparing with the $P$-wave charmonia and with the recent analysis of the newly discovered $\Omega_c$ baryons. Given the uncertain experimental situation on the $Y$ states, we allow for two different spectra and discuss the related parameters in the diquark model, including the constrains from $\Omega_c$ baryons. The diquark model allows to select a preferable $Y$-states pattern. The existence of higher resonances, as the one predicted with $L=3$, would be another footprint of the underlying diquark dynamics