The new resonances Z_{cs}(3985) and Z_{cs}(4003) (almost) fill two tetraquark nonets of broken SU(3)_f

TL;DR

Recent experimental discoveries of Z_{cs}(3985) and Z_{cs}(4003) resonances support the tetraquark model and fill two nonets of broken SU(3)_f symmetry, aligning with quark model predictions.

Contribution

This paper demonstrates that the new Z_{cs} resonances fit naturally into the tetraquark framework, filling predicted SU(3)_f multiplets and mirroring patterns seen in other exotic states.

Findings

Z_{cs}(3985) and Z_{cs}(4003) are consistent with tetraquark states.

The resonances fill two nonets of broken SU(3)_f symmetry.

The near-degeneracy mirrors the pattern seen in X(3872) and Z_c(3900).

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 Z_{cs} (3985) and Z_{cs}(4003), which have a natural accommodation in the tetraquark picture, as shown in this note. The quasi-degeneracy between Z_{cs} (3985) and Z_{cs}(4003) reproduces, in the strange sector, the situation observed with X(3872) and Z_c(3900). This represents a significative score in favor of the tetraquark scheme.