Some remarks on X(6900) |
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| Authors: | Qin-Fang Cao Hao Chen Hong-Rong Qi Han-Qing Zheng |
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| Affiliation: | 1. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China2. Department of Engineering Physics, Tsinghua University, Beijing 100084, China3. Collaborative Innovation Center of Quantum Matter, Beijing 100871, China |
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| Abstract: | The analysis of the LHCb data on begin{document}$X(6900)$end{document}![]() ![]() found in the di-begin{document}$J/psi$end{document}![]() ![]() system was performed using a momentum-dependent Flatté-like parameterization. The use of the pole counting rule and spectral density function sum rule provides consistent evidence that both confining and molecular states are possible. Alternatively, the nature of begin{document}$X(6900)$end{document}![]() ![]() cannot be distinguished if only the di-begin{document}$J/psi$end{document}![]() ![]() experimental data with current statistics are available. Nevertheless, we found that the lowest state in the di-begin{document}$J/psi$end{document}![]() ![]() system likely has the same quantum numbers as begin{document}$X(6900)$end{document}![]() ![]() , and begin{document}$X(6900)$end{document}![]() ![]() is probably not interpreted as a begin{document}$J/psi-psi(2S)$end{document}![]() ![]() molecular state. |
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| Keywords: | X(6900) molecular state tetraquark pole counting rule spectral density function |
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