New data from BESIII and LHCb indicate the existence of two hidden charm, open strangeness resonances, Zcs(3985) and Zcs(4003). The near degeneracy of Zcs(3985) and Zcs(4003) reproduces, in the strange sector, the situation observed with X(3872) and Zc(3900). We show that, in the tetraquark picture, the Zcs resonances neatly fit into two SU(3)f nonets with JP = 1+ and oppo- site charge-conjugation, together with X(3872), X(4140) and Zc(3900). The mass of the missing element of the nonets is predicted. The classification represents a significative score in favour of the tetraquark model.
The new resonances Zcs(3985) and Zcs(4003) (almost) fill two tetraquark nonets of broken SU(3)f / Maiani, Luciano; Polosa, Antonio D.; Riquer, Verónica. - In: SCIENCE BULLETIN. - ISSN 2095-9273. - 66:16(2021), pp. 1616-1619. [10.1016/j.scib.2021.04.040]
The new resonances Zcs(3985) and Zcs(4003) (almost) fill two tetraquark nonets of broken SU(3)f
Maiani, Luciano;Polosa, Antonio D.;Riquer, Verónica
2021
Abstract
New data from BESIII and LHCb indicate the existence of two hidden charm, open strangeness resonances, Zcs(3985) and Zcs(4003). The near degeneracy of Zcs(3985) and Zcs(4003) reproduces, in the strange sector, the situation observed with X(3872) and Zc(3900). We show that, in the tetraquark picture, the Zcs resonances neatly fit into two SU(3)f nonets with JP = 1+ and oppo- site charge-conjugation, together with X(3872), X(4140) and Zc(3900). The mass of the missing element of the nonets is predicted. The classification represents a significative score in favour of the tetraquark model.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
