Open charm tetraquarks in broken SU3F symmetry

Prompted by a recent lattice QCD calculation, we review the SU(3) light quark flavor structure of charmed tetraquarks with spin 0 diquarks. Fermi statistics forces the three light quarks to be in the representation . This agrees with the weak repulsion in the of the in scattering studied on the lattice. We analyze the multiplet broken by the strange quark mass and determine the five independent masses from the known masses of diquarks. The mass of is predicted within 50 MeV accuracy. The recently observed and , likely part of a multiplet, with flavor composition , and , an isosinglet with flavor composition ¯ 𝑐 ⁢ ¯ 𝑠 ⁢𝑢⁢𝑑, fit naturally in a 𝟑 ⊕ ¯ 𝟔 structure as the first radial excitations. We discuss also the decay modes of 𝐷* 𝑠⁢0⁡(2317), of the radial excitations and of the predicted particles.