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The spectrum of tetraquark states with hidden charm is studied within aneffective QCD Coulomb gauge Hamiltonian approach. Of the four independent colorschemes, two are investigated, the $(q\bar{c})_1(c\bar{q})_1$ singlet-singlet(molecule) and the $(qc)_3(\bar{q}\bar{c})_3$ triplet-triplet (diquark), forselected $J^{PC}$ states using a variational method. The predicted masses oftriplet-triplet tetraquarks are roughly a GeV heavier than the singlet-singletstates. There is also an interesting flavor dependence with$(q\bar{q})_1(c\bar{c}_1)$ states about half a GeV lighter than$(q\bar{c})_1(\bar{q}c)_1$. The lightest $1^{++}$ and $1^{--}$ predictions arein agreement with the observed X(3872) and Y(4008) masses, respectively,suggesting they both have a $\omega J/ \psi$ rather than $D^*\bar D^*$molecular type structure. This is consistent with observed $X$, $Y$ decays to$\pi^\pm J/ \psi$ and not $D^*\bar D^*$ .

Coulomb gauge model for hidden charm tetraquarks