论文标题
x（2900）在手性夸克模型中
X(2900) in a chiral quark model
论文作者
论文摘要
最近，LHCB合作报告了他们对前两个完全开放风味的Tetraquark州的观察，名为$ x_0（2900）$和$ x_1（2900）$，均为未知的奇偶校验。受报告的启发，我们考虑了$ x（2900）$的所有可能的四夸克候选者，包括分子结构和diquark结构，借助高斯膨胀方法，在手性夸克模型中。还考虑了两个不同的结构耦合。为了识别真正的共振，采用了实量表方法（稳定方法）。结果表明，没有$ x（2900）$的候选者以$ 00^+$和$ 01^+$ $ $ $ $ cs \ bar {q} \ bar {q} \ bar {q} $系统低于$ d^*\ bar {k {k}^*$的阈值，而$ p $ p $ cs $ cs $ cs \ bar \ bar \ bar \ bar^q} Q { $ d_1 \ bar {k} $和$ d_j \ bar {k} $，可以是$ x（2900）$的候选者。这样，我们将负平均值分配给$ x_1（2900）$，而$ x_0（2900）$也许是$ d^*\ bar {k}^*$的阈值以上的共振状态，需要进行更多的计算。
Recently, the LHCb Collaboration reported their observation of the first two fully open-flavor tetraquark states named $X_0(2900)$ and $X_1(2900)$ with unknown parity. Inspired by the report, we consider all of possible four-quark candidates of $X(2900)$ including molecular structure and diquark structure in a chiral quark model with the help of Gaussian expansion method. Two different structures coupling is also considered. To identify the genuine resonances, real-scaling method (stabilization method) was employed. The results show that no candidate of $X(2900)$ is founded in $00^+$ and $01^+$ $cs\bar{q}\bar{q}$ system below the threshold of $D^*\bar{K}^*$, while there are two states in the $P$-wave excited $cs\bar{q}\bar{q}$ system, $D_1\bar{K}$ and $D_J\bar{K}$, which could be candidates of $X(2900)$. In this way, we assign negative parity to $X_1(2900)$, and $X_0(2900)$ maybe a resonance state above the threshold of $D^*\bar{K}^*$, more calculation is needed.
