The fully heavy scalar tetraquarks $T_{\mathrm{4Q}}=QQ\bar{Q}\bar{Q}$, ($Q=c,b$) are explored in the context of QCD sum rule method. We model $T_{\mathrm{4Q}}$ as diquark-antidiquark systems composed of pseudoscalar constituents, and calculate their masses $m^{(\prime )}$ and couplings $f^{(\prime )}$ within the two-point sum rule approach. Our results $m=(6928\pm 50)\mathrm{MeV}$ and $m^{\prime }=(18858\pm 50)\mathrm{MeV}$ for masses of the tetraquarks $T_{\mathrm{4c}}$ and $T_{\mathrm{4b}}$ prove that they can decay to hidden-flavor heavy mesons. The full width ${\mathrm{\Gamma }}_{\mathrm{4c}}$ of the $T_{\mathrm{4c}}$ is evaluated by taking into account the decay channels $T_{\mathrm{4c}}\to J/\psi J/\psi$, $J/\psi {\psi }^{\prime }$, ${\eta }_c{\eta }_c$, ${\eta }_c{\eta }_c(2S)$, ${\eta }_c{\chi }_{c1}(1P)$, and ${\chi }_{c0}{\chi }_{c0}$. The partial widths of these processes depend on strong couplings $g_i$ at vertices $T_{\mathrm{4c}}J/\psi J/\psi$, $T_{\mathrm{4c}}J/\psi {\psi }^{\prime }$ etc., which are computed using the QCD three-point sum rule method. The decay $T_{\mathrm{4b}}\to {\eta }_b{\eta }_b$ is used to find the width ${\mathrm{\Gamma }}_{\mathrm{4b}}$ of the $T_{\mathrm{4b}}$. The predictions for m and ${\mathrm{\Gamma }}_{\mathrm{4c}}=(128\pm 22)\mathrm{MeV}$ are compared with parameters of the fully charmed resonances reported by the LHCb, ATLAS, and CMS Collaborations. Based on this analysis, we interpret the tetraquark $T_{\mathrm{4c}}$ as a candidate to the resonance $X(6900)$. The mass $m^{\prime }$ and width ${\mathrm{\Gamma }}_{\mathrm{4b}}=(94\pm 28)\mathrm{MeV}$ of the exotic meson $T_{\mathrm{4b}}$ can be used in future experimental investigations of these states.

全重标量四夸克${\mathrm{时间}}_{\mathrm{第四季度}}=问问\overline{问}\overline{问}$, ($问=C,乙$）在 QCD 求和规则方法的背景下进行了探索。我们建模${\mathrm{时间}}_{\mathrm{第四季度}}$作为由赝标量成分组成的双夸克-反双夸克系统，并计算它们的质量${米}^{（\prime ）}$和联轴器$F^{（\prime ）}$在两点和规则方法内。我们的成果$米=（6928\pm 50）\mathrm{兆伏}$和${米}^{\prime }=（18858\pm 50）\mathrm{兆伏}$对于四夸克的质量${\mathrm{时间}}_{\mathrm{4c}}$和${\mathrm{时间}}_{\mathrm{4b}}$证明它们可以衰变成隐味重介子。全宽${\mathrm{\gamma }}_{\mathrm{4c}}$的${\mathrm{时间}}_{\mathrm{4c}}$通过考虑衰减通道来评估${\mathrm{时间}}_{\mathrm{4c}}\to J/\psi J/\psi$,$J/\psi {\psi }^{\prime }$,${\eta }_C{\eta }_C$,${\eta }_C{\eta }_C（2S）$,${\eta }_C{\chi }_{C1}（1磷）$， 和${\chi }_{C0}{\chi }_{C0}$。这些过程的部分宽度取决于强耦合$G_{我}$在顶点${\mathrm{时间}}_{\mathrm{4c}}J/\psi J/\psi$,${\mathrm{时间}}_{\mathrm{4c}}J/\psi {\psi }^{\prime }$等，使用QCD三点和规则法计算。衰败${\mathrm{时间}}_{\mathrm{4b}}\to {\eta }_{乙}{\eta }_{乙}$用于查找宽度${\mathrm{\gamma }}_{\mathrm{4b}}$的${\mathrm{时间}}_{\mathrm{4b}}$。m和的预测${\mathrm{\gamma }}_{\mathrm{4c}}=（128\pm 22）\mathrm{兆伏}$与 LHCb、ATLAS 和 CMS 合作报告的完全魅力共振的参数进行了比较。基于这一分析，我们解释了四夸克${\mathrm{时间}}_{\mathrm{4c}}$作为共振的候选者$X（6900）$。质量${米}^{\prime }$和宽度${\mathrm{\gamma }}_{\mathrm{4b}}=（94\pm 28）\mathrm{兆伏}$奇异介子${\mathrm{时间}}_{\mathrm{4b}}$可用于这些状态的未来实验研究。