Title: Predicting charmed-strange molecular tetraquarks with $K^{(*)}$ and $T$-doublet (anti-)charmed meson Show Chinese title

Title: 用$K^{(*)}$和$T$双态 (反) 重夸克介子预测奇异-魅分子四夸克态

Abstract: In this work, we systematically investigate the charmed-strange molecular tetraquarks composed of a $K^{(*)}$ meson and a $T$-doublet (anti-)charmed meson. Our analysis is performed within the one-boson-exchange model, with a careful treatment of $S$-$D$ wave mixing and coupled-channel effects. We identify the $X_1(2900)$ resonance, observed by LHCb, as a molecular state in the coupled $K \bar{D}_1 / K^* \bar{D}_1 / K^* \bar{D}_2^*$ system with quantum numbers $I(J^P)=0(1^-)$. This state is dominated by the $K \bar{D}_1$ component but exhibits a significant admixture from the $K^* \bar{D}_1$ channel. Furthermore, we predict several partner states of the $X_1(2900)$ in the $K^*\bar{D}_1$ and $K^{(*)}\bar{D}_2^*$ systems. We also extend our framework to the $K^{(*)} {D}_1/K^{(*)} {D}_2^*$ systems, where our results suggest a series of $T_{c \bar s}$-type charmed-strange molecular tetraquark candidates. These findings provide a comprehensive picture of the molecular spectrum in the charmed-strange sector and can be tested in future experimental studies. Show Chinese abstract

Abstract: 在本工作中，我们系统地研究由一个$K^{(*)}$介子和一个$T$-双态（反）charm 介子组成的含 charm 和 strange 的分子四夸克态。 我们的分析是在单玻色子交换模型中进行的，对$S$-$D$波混合和耦合通道效应进行了仔细处理。 我们将 LHCb 观测到的$X_1(2900)$共振态识别为在耦合的$K \bar{D}_1 / K^* \bar{D}_1 / K^* \bar{D}_2^*$系统中的分子态，其量子数为$I(J^P)=0(1^-)$。 这种状态主要由$K \bar{D}_1$成分主导，但表现出来自$K^* \bar{D}_1$通道的重要混合。 此外，我们预测了$X_1(2900)$在$K^*\bar{D}_1$和$K^{(*)}\bar{D}_2^*$系统中的几个伙伴态。 我们还将框架扩展到了$K^{(*)} {D}_1/K^{(*)} {D}_2^*$系统，在那里我们的结果表明了一系列$T_{c \bar s}$类的粲奇分子四夸克候选态。 这些发现为粲奇区的分子谱提供了全面的图景，并可在未来的实验研究中进行验证。