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

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Tetraquark Physics Particle physics Strangeness Resonance (particle physics) Symmetry (geometry) Degeneracy (biology) Quark Hadron Mathematics Biology Bioinformatics Geometry

Luciano Maiani , A. D. Polosa , V. Riquer ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2103.08331 · OA: W3137691629

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.