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How the X(5568) challenges our understanding of QCD · Around

2016

How the X(5568) challenges our understanding of QCD

Guo, Feng-Kun, Meißner, Ulf-G., Zou, Bing-Song

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We discuss the X(5568) particle recently announced by the D0 Collaboration.

Several types of models were proposed to explain this structure in the literature.
As pointed out by Burns and Swanson (arXiv:1603.04366), none of them provides a satisfactory description of the observation.
We provide additional arguments using general properties of QCD, and conclude that the observation of the X(5568), if confirmed, poses serious challenges to our understanding of nonperturbative QCD.

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M. Cleven, H. W. Grießhammer, F.-K. Guo, C. Hanhart and U.-G. Meißner, Eur. Phys. J. A 50
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LHCb Collaboration, LHCb-CONF-2016-004, the 51st Rencontres de Moriond on QCD and High Energy Interactions, La Thuile, Italy, 19–26 March 2016, http://cds.cern.ch/record/2140095
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