The new vector resonance $X_1(2900)$ observed recently by LHCb in the $D^{-}{K}^{+}$ invariant mass distribution in the decay $B^{+}\to D^{+}{D}^{-}{K}^{+}$ is studied to uncover internal structure of this state, and calculate its physical parameters. In the present paper, the resonance $X_1(2900)$ is modeled as an exotic vector state, $J^P=1^{-}$, built of the light diquark $u^{T}C{\gamma }_{5}d$ and heavy antidiquark $\bar{c}{\gamma }_{\mu }{\gamma }_{5}C{\bar{s}}^T$. The mass and current coupling of $X_1(2900)$ are computed using the QCD two-point sum rule approach by taking into account various vacuum condensates up to dimension 10. The width of the resonance $X_1(2900)$ is saturated by two decay channels $X_1\to D^{-}{K}^{+}$ and $X_1\to {\bar{D}}^0{K}^0$. The strong couplings $g_1$ and $g_2$ corresponding to the vertices $X_1{D}^{-}{K}^{+}$ and $X_1{\bar{D}}^0{K}^0$ are evaluated in the context of the QCD light-cone sum rule method and technical tools of the soft-meson approximation. Results for the mass of the resonance $X_1(2900)$ $m=(2890\pm 122)\text{MeV}$, and for its full width ${\mathrm{\Gamma }}_{\mathrm{full}}=(93\pm 13)\text{MeV}$ are smaller than their experimental values reported by the LHCb collaboration. Nevertheless, by taking into account theoretical and experimental errors of investigations, interpretation of the state $X_1(2900)$ as the vector tetraquark does not contradict to the LHCb data. We also point out that analysis of the invariant mass distribution $D^{+}{K}^{+}$ in the same decay $B^{+}\to D^{+}{D}^{-}{K}^{+}$ may reveal doubly charged four-quark structures $[uc][\bar{s}\bar{d}]$.

新的矢量共振 $X_{\mathrm{1个}}（2900）$ LHCb最近在 $d^{-}{ķ}^{+}$ 衰减中的不变质量分布 ${乙}^{+}\to d^{+}{d}^{-}{ķ}^{+}$研究发现这种状态的内部结构，并计算其物理参数。在本文中，共鸣$X_{\mathrm{1个}}（2900）$ 被建模为外来矢量状态 ${Ĵ}^P={\mathrm{1个}}^{-}$，由轻夸克制成 ${ü}^{Ť}C{\gamma }_{5}d$ 和重的反夸克 $\stackrel{〜}{C}{\gamma }_{\mu }{\gamma }_{5}C{\stackrel{〜}{s}}^{Ť}$。的质量和电流耦合$X_{\mathrm{1个}}（2900）$ 使用QCD两点求和规则方法，通过考虑到尺寸10的各种真空冷凝物来计算。 $X_{\mathrm{1个}}（2900）$ 被两个衰减通道饱和 $X_{\mathrm{1个}}\to d^{-}{ķ}^{+}$ 和 $X_{\mathrm{1个}}\to {\stackrel{〜}{d}}^0{ķ}^0$。牢固的联轴器$G_{\mathrm{1个}}$ 和 $G_{\mathrm{2个}}$ 对应于顶点 $X_{\mathrm{1个}}{d}^{-}{ķ}^{+}$ 和 $X_{\mathrm{1个}}{\stackrel{〜}{d}}^0{ķ}^0$在QCD圆锥总和法则方法和软介子近似技术工具的背景下进行评估。共振质量的结果$X_{\mathrm{1个}}（2900）$ $米=（2890\pm 122）\text{电动汽车}$，并为其全宽 ${\mathrm{\Gamma }}_{\mathrm{满的}}=（93\pm 13）\text{电动汽车}$小于LHCb合作报告的实验值。尽管如此，通过考虑调查的理论和实验错误，对国家进行解释$X_{\mathrm{1个}}（2900）$因为矢量四夸克与LHCb数据不矛盾。我们还指出了不变质量分布的分析$d^{+}{ķ}^{+}$ 在同一衰变中 ${乙}^{+}\to d^{+}{d}^{-}{ķ}^{+}$ 可能揭示双电荷的四夸克结构 $[üC][\stackrel{〜}{s}\stackrel{〜}{d}]$。