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Relation between $T_(cc)$ and X(3872) from QCD
Dias J.M., Narison S., Navarra F.S., Nielsen M., Richard J.-M.
Physics Letters B 703 (2011) 274-280 - http://hal.in2p3.fr/in2p3-00596739
Physique/Physique des Hautes Energies - Expérience
Physique/Physique des Hautes Energies - Phénoménologie
Relation between $T_{cc}$ and X(3872) from QCD
J. M. Dias, S. Narison1, F. S. Navarra, M. Nielsen, J.-M. Richard2
1 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
CNRS : UMR5207 – IN2P3 – Université Montpellier II - Sciences et techniques
Bât 13- 1er Et. - CC 070 Place Eugène Bataillon 34095 MONTPELLIER CEDEX 5
2 :  IPNL - Institut de Physique Nucléaire de Lyon
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
We have studied, using double ratio of QCD (spectral) sum rules, the ratio between the masses of $T_{cc}$ and X(3872) assuming that they are respectively described by the $D-{D}^*$ and $D-\bar{D}^*$ molecular currents. We found (within our approximation) that the masses of these two states are almost degenerate. Since the pion exchange interaction between these mesons is exactly the same, we conclude that if the observed X(3872) meson is a $D\bar{D}^*+c.c.$ molecule, then the $DD^*$ molecule should also exist with approximately the same mass. An extension of the analysis to the $b$-quark case leads to the same conclusion. We also study the SU(3) breakings for the $T^s_{QQ}/T_{QQ}$ mass ratios.

Articles dans des revues avec comité de lecture
Physics Letters B (Phys. Lett. B)
Publisher Elsevier
ISSN 0370-2693 

7 pages, 7 figures
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