Lineshape of the compact fully heavy tetraquark

Hadrons and their distributions are the most direct observables in experiments, which would shed light on nonperturbative mystery of quantum chromodynamics. As result, any new hadron will challenge our current knowledge one hand, provide additional inputs other hand. The fully heavy $cc\overline{c}\overline{c}$ system observed by LHCb recently opened a era for physics. We first extract internal structure tetraquarks directly from experimental data, within compact tetraquark picture. By fitting to di-$J/\ensuremath{\psi}$ lineshape, we find that $X(6900)$ is only cusp effect $J/\ensuremath{\psi}\ensuremath{\psi}(3770)$ channel. In addition, there also slightly below 6.8 GeV stemming $J/\ensuremath{\psi}{\ensuremath{\psi}}^{\ensuremath{'}}$ two ${0}^{++}$ behave as resonances above di-${\ensuremath{\eta}}_{c}$ threshold, respectively. ${2}^{++}$ state bound threshold. Furthermore, ${X}_{{0}^{++}}(6035)$ shows significant lineshape even after coupled channel effect. This an unique feature can distinguish loosely hadronic molecules.