Year: 2016
Type: article
Abstract: Stimulated by the recent observation of the exotic X(5568) state by the D0 Collaboration, we study the four-quark system $$us\bar{b}\bar{d}$$ with quantum numbers $$J^P=0^+$$ in the framework of the chiral quark model. Two structures, diquark–antidiquark and meson–meson, with all possible color configurations are investigated by using the Gaussian expansion method. The results show that the energies of the tetraquark states with diquark–antiquark structure are too high to be candidates of X(5568), and no molecular structure can be formed in our calculations. The calculation is also extended to the four-quark system $$us\bar{c}\bar{d}$$ and the same results as that of $$us\bar{b}\bar{d}$$ are obtained.
Source: The European Physical Journal C
Authors: Xiaoyun Chen, Jialun Ping
Institution: Nanjing Normal University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Awards: 有关强作用物质性质和结构的研究, 非淬火夸克模型与强子谱研究
OpenAlex ID: W2341349544