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arXiv · 1801.03073

XYZ - SU3 Breakings from Laplace Sum Rule at Higher Orders: Summary

R. Albuquerque·S. Narison·D. Rabetiarivony·G. Randriamanatrika
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Abstract

This talk reviews and summarizes some of our results in [1] on XYZ- SU3 Breakings obtained from QCD Laplace Sum Rules (LSR) at next-to-next-leading order (N2LO) of perturbative (PT) theory and including next-to-leading order (NLO) SU3 breaking corrections and leading order (LO) contributions of dimensions d< (6 - 8) non-perturbative condensates. We conclude that the observed X states are good candidates for being 1^++ and 0^++ molecules states. We find that the SU3 breakings are relatively small for the masses (< 10 (resp. 3) %) for the charm (resp. bottom) channels while they are large (< 20 %) for the couplings. Like in the chiral limit case, the couplings decrease faster: 1/m_b^3/2 than 1/m_b^1/2 of HQET. Our approach cannot clearly separate ( within the errors ) some molecule states from the four-quark ones with the same quantum numbers.

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R. Albuquerque, S. Narison, D. Rabetiarivony, G. Randriamanatrika. 2018-01-09. XYZ - SU3 Breakings from Laplace Sum Rule at Higher Orders: Summary. https://arxiv.org/abs/1801.03073

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