Flavored tetraquark spectroscopy
  The recent confirmation of the charged charmonium like resonance Z(4430) by the LHCb experiment strongly suggests the existence of QCD multi quarks bound states. Some preliminary results about hypothetical flavored tetraquark mesons are reported. Such states are particularly amenable to Lattice QCD studies as their interpolating operators do not overlap with those of ordinary hidden-charm mesons. 
A.L. Guerrieri, M. Papinutto, A. Pilloni, A.D. Polosa, N. Tantalo
hep-lat