The nature of the recently discovered Z_cZc
and Z_bZb
structures is intriguing. Their charge forces its minimal quark content
to be Q\bar Q q\bar qQQ‾qq‾
(where Q=\{c,b\}Q={c,b}
and q=\{u,d\}q={u,d}).
In this work we perform a molecular coupled-channels calculation of the
I^G(J^{PC})=1^+(1^{+-})IG(JPC)=1+(1+−)
charm and bottom sectors in the framework of a constituent quark model
which satisfactorily describes a wide range of properties of
(non-)conventional hadrons containing heavy quarks. All the relevant
channels are included for each sector, i.e.: The
D^{(\ast)}\bar D^{\ast}+h.c.D(*)D‾*+h.c.,
\pi J/\psiπJ/ψ
and \rho\eta_cρηc
channels for the Z_cZc
and B^{(\ast)}B^{\ast}B(*)B*
and \Upsilon(nS)\piΥ(nS)π
(n=1,2,3n=1,2,3)
channels for the Z_bZb
analysis. Possible structures of these resonances will be discussed.
Zb
structures in a constituent quark model coupled-channels calculation
