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(ar Xiv:1603.04366),none o...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(ar Xiv: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.展开更多
基金Supported by DFG and National Natural Science Foundation of China Through Funds Provided to the Sino-German CRC 110"Symmetriesthe Emergence of Structure in QCD"(National Natural Science Foundation of China under Grant No.11261130311)+1 种基金the Thousand Talents Plan for Young Professionalsand the Chinese Academy of Sciences President’s International Fellowship Initiative under Grant No.2015VMA076
文摘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(ar Xiv: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.
