Heavy-Light Exotics from QCD Laplace Sum Rules at N2LO in the chiral limit
Abstract
These talks review and summarize our results in [1,2] on XYZ-like spectra obtained from QCD Laplace Sum Rules in the chiral limit at next-to-next-leading order (N2LO) of perturbation theory (PT) and including leading order (LO) contributions of dimensions d≤ 6-8 non-perturbative condensates. We conclude that the observed XZ states are good candidates for 1+ and 0+ molecules or / and four-quark states while the predictions for 1- and 0- states are about 1.5 GeV above the Yc,b experimental candidates and hadronic thresholds. We (numerically) find that these exotic molecules couple weakly to the corresponding interpolating currents than ordinary D,B heavy-light mesons while we observe that these couplings decrease faster [1/mb3/2 (resp. 1/mb) for the 1+,0+ (resp. 1-,0-) states] than 1/mb1/2. Our results do not also confirm the existence of the X(5568) state in agreement with LHCb findings.