论文标题
$ s $ wave $ \ bar d^\ ast k^\ ast $ hadronic分子的衰减的研究：标量$ x_0（2900）$及其旋转伙伴$ x_ {j（j = 1,2）} $
A study of the decays of $S-$wave $\bar D^\ast K^\ast$ hadronic molecules: the scalar $X_0(2900)$ and its spin partners $X_{J(J=1,2)}$
论文作者
论文摘要
在这项工作中，我们调查了完全开放的Tetraquark State $ X_0（2900）$的衰败，该损失最近被LHCB合作所观察到。在这里，$ x_0（2900）$被分配为$ s $ wave $ \ bar d^\ ast k^\ ast $ ast $ hadronic分子，$ i = 0 $，并且采用了有效的拉格朗日方法来估计部分衰减宽度。此外，我们还预测了其他未观察到的$ x_ {j（j = 1,2）} $的衰减行为，这是$ x_0（2900）$的自旋合作伙伴，$ s $ s $ wave $ \ bar d^\ ast ast k^\ ast k^\ ast ast $图片。有人指出，$ i = 0 $的$ x_1 $状态是一个宽的状态，其宽度超过一百meV，而另一个$ x_2 $ a = 0 $的$ x_2 $状态是一个狭窄的状态，宽度的一半接近$ x_0（2900）$。此外，我们的结果还表明，预计$ \ bar d^\ ast k $模式是$ x_1 $和$ x_2 $的主要衰减模式。在将来的实验中搜索那些未观察到的$ x_ {j（j = 1,2）} $可能会有所帮助了解$ x_0（2900）$的性质。
In this work, we investigated the decays of the fully open-flavor tetraquark state $X_0(2900)$ which was observed by the LHCb Collaboration very recently. Here, the $X_0(2900)$ was assigned as a $S-$wave $\bar D^\ast K^\ast$ hadronic molecule with $I=0$, and the effective lagrangian approach was applied to estimate the partial decay widths. Moreover, we also predicted the decay behaviors of the other unobserved $X_{J(J=1,2)}$, which were the spin partners of the $X_0(2900)$ in the $S-$wave $\bar D^\ast K^\ast$ picture. It was pointed out that the $X_1$ state with $I=0$ was a broad state with the width more than one hundred MeV, while another $X_2$ state with $I=0$ was a narrow state with the width approaching half of that for the $X_0(2900)$. In addition, our results also showed that the $\bar D^\ast K$ mode was expected to be the dominant decay mode for both $X_1$ and $X_2$. Searching for those unobserved $X_{J(J=1,2)}$ in the future experiments might be helpful to understand the nature of $X_0(2900)$.
