Z(4430)and a new paradigm for spin interactions in tetraquarks

Abstract

Following the recent confirmation of the $Z^{+}(4430)$ resonance with $J^{PG}=1^{++}$, we have re-examined the model of $S$- and $P$-wave tetraquarks. We propose a “type-II” diquark-antidiquark model which shows to be very effective at producing a simple and comprehensive picture of the $J^{PG}=1^{++}$ and $1^{--}$ sectors of the recently discovered charged tetraquarks and of the observed $Y$ resonances. The model is still faced with the unresolved difficulty of explaining why some states seem to have incomplete isospin multiplets. DOI: http://dx.doi.org/10.1103/PhysRevD.89.114010 © 2014 American Physical Society