partly supported by the National Natural Science Foundation of China(11975033 and 12070131001);Chongqing Natural Science Foundation(cstc2019jcyj-msxm X0409);Fundamental Research Funds for the Central Universities(SWU118111)。
Recently,the LHCb Collaboration reported the doubly charmed state T^(+)with IJ^(P)=01^(+)in the D^(0)^(0)π^(+) invariant mass spectrum[1].Its extremely small binding energy and width can match very well with the pred...
Hadrons made by diquark-antidiquark pairs(tetraquarks)are held together by QCD forces in an overall color singlet.As stated in the original proposals and similarly to baryons and qq mesons,tetraquarks form complete mu...