Gluonic Tetracharm Configuration of $X(6900)$

Abstract

Recently, a new hadronic structure at around $6.9$ GeV was observed in an LHCb experiment. From its limited yet known decay mode, one could still determine that it contains at least four charm quarks and hence belongs to the category of exotic state. This finding indicates for the first time the tetracharm exotic states and is therefore quite importance. In this letter, we propose a nature hybrid interpretation for the structure of $X(6900)$, i.e. in $[{\bar{3}}_c{]}_{cc}\otimes [8_c{]}_G\otimes [3_c{]}_{\bar{c}\bar{c}}$ configuration with $J^{PC}=0^{++}$, and by using the QCD Sum Rule technique we performed mass spectrum calculation. The results showed that the observed $X(6900)$ could be a gluonic tetracharm state, and some other structures may exist, e.g., one around $7.2$ GeV in the tetracharm hybrid configuration and with $J^{PC}=0^{-+}$. We also predict the tetrabottom hybrid states, leaving for future experiment.

arXiv comment14 pages, 4 figures, published in PLB

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• Investigating the internal structure of $X(6900)$ in the $2J/\psi$ decay channel
• Baryons and baryoniums in the perspective of QCD sum rules
• Fully strange tetraquark states via QCD sum rules
• Study of Fully heavy Pentaquarks using extended Gursey-Radicati formalism
• Strange pentaquark molecules in QCD sum rules