Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5493736 | Nuclear and Particle Physics Proceedings | 2017 | 9 Pages |
Abstract
These talks review and summarize our results in [1, 2] on XYZ-like spectra obtained from QCD Laplace Sum Rule in the chiral limit at next-to-next-leading order (N2LO) of perturbation theory (PT) and including leading order (LO) contributions of dimensions dâ¤6â8 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 1â and 0â 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. 1â, 0â) states] than 1/mb1/2. results do not also confirm the existence of the X(5568) state in agreement with LHCb findings.
Keywords
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Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
R.M. Albuquerque, F. Fanomezana, S. Narison, A. Rabemananjara, D. Rabetiarivony, G. Randriamanatrika,