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 incor- porating the dominant spin–spin, spin–orbit and tensor inter- actions. We compare with other P-wave systems such as P -wave charmonia and the newly discovered c baryons, analysed recently in this framework. Given the uncertain experimental situation on the Y states, we allow for differ- ent spectra and discuss the related parameters in the diquark model. In addition to the presently observed ones, we expect many more states in the supermultiplet of L = 1 diquarkonia, whose J PC quantum numbers and masses are worked out, using the parameters from the currently preferred Y -states pattern. The existence of these new resonances would be a decisive footprint of the underlying diquark dynamics