The new resonances Zcs(3985) and Zcs(4003) (almost) fill two tetraquark nonets of broken SU(3)f
Abstract
New data from BESIII and LHCb show the existence of resonances with strangeness filling multiplets of the broken SU(3)f symmetry, with the pattern predicted by the quark model. This is the case of the newly discovered Zcs (3985) and Zcs(4003), which have a natural accommodation in the tetraquark picture, as shown in this note. The quasi-degeneracy between Zcs (3985) and Zcs(4003) reproduces, in the strange sector, the situation observed with X(3872) and Zc(3900). This represents a significative score in favor of the tetraquark scheme.
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