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We use QCD spectral sum rules (QSSR) and the factorization properties ofmolecule currents to estimate the masses and couplings of the $\bar D^*D$ and$\bar B^*B~(1^{++})$ molecules at N2LO of PT QCD. We include in the OPE thecontributions of non-perturbative condensates up to dimension-eight. With theLaplace sum rules approach (LSR) and in the $\overline{MS}$-scheme, we obtain$M_{D^*D}=3738(152)$ MeV, which agrees within the errors with the newlydiscovered $Z_c$(3900). For the bottom channel, we find $M_{B^*B}=10687(232)$MeV in good agreement with the observed $Z_b$(10610). Couplings of these statesto the currents are also extracted. Our results are improvements of the LO onesin the existing literature.

$ \bar D^*D$ and $\bar B^*B~(1^{++})$ molecules at N2LO from QSSR

$ \bar D^D$ and $\bar B^B~(1^{++})$ molecules at N2LO from QSSR