1+XTZ States within QCD Sum Rules

We present improved estimates of the couplings, masses and mass ratios of the XQ, ZQ and TQQ q over bar q over bar ' states (Q E c, b ; q, q' E u, d, s) using (inverse) QCD Laplace sum rules (LSR), their ratios R and double ratios (DRSR), within stability criteria. We conclude that the observed Xc(3872) and Zc(3900) are tetramoles states (superposition of quasi -degenerated molecule and tetraquark states having similar couplings to the currents) with the predicted masses: MTXc = 3876(44) MeV and MTZc = 3900(42) MeV. We also do an extensive analysis of the four-quark nature of differ-ent TQQ q over bar q over bar ' axial-vector states. Then, combining R and DRSR, we reanalyze the observed state Xc(3872) and we obtain a precise prediction of MTcc1+ =3886(6) MeV. Extending to the beauty sector, we find the results: MTZb = 10579(99) MeV and MXb = 10545(131) MeV. Finally, we confront our combined LSR (R) DRSR results with the ones from some other approaches (lattices and quark models).