 | : : $s$-channel representative Feynman diagrams induced by $X(6900)$ for $gg \rightarrow J/\psi J/\psi$. |
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 | Dependence of $N_{{\rm sig}}$ on the effective coupling constants $g_{ggX}$ and $g_{c\bar{c}X}$ at a combination of the luminosity of $\sqrt{s} = 7, 8$ and $13~{\rm TeV}$ LHC. The parameter space region above the red line is excluded by the experimental constraint of $\Gamma[X(6900) \rightarrow gg] + \Gamma[X(6900) \rightarrow c\bar{c}] < \Gamma[X(6900) \rightarrow all] \simeq 168~ {\rm MeV}$. The black lines stand for the experimental constraint given by the yield of $N_{{\rm sig}} = 784 \pm 148$. |
 | $\text{Di-}J/\psi$ invariant mass distribution of cross sections (upper) and event numbers (lower) for both signal and SM background for $pp \rightarrow J/\psi J/\psi \rightarrow 4\mu$ at the benchmark point $B$. $S$ and $\hat{S}$ represent the new physics signals induced by $X(6900)$ with and without interference effect, respectively. |
 | $\text{Di-}J/\psi$ invariant mass distribution of cross sections (upper) and event numbers (lower) for both signal and SM background for $pp \rightarrow J/\psi J/\psi \rightarrow 4\mu$ at the benchmark point $B$. $S$ and $\hat{S}$ represent the new physics signals induced by $X(6900)$ with and without interference effect, respectively. |