论文标题
$ \ bar d^{*} k^{*} $（$ d^{*} k^{*} $）的可能分子状态和新的外来状态$ x_0（2900）$和$ x_1（2900）$（2900）$（$ t^a__ {cs0}（cs0}（2900）（2900）^0 $和$ T^a__
Possible molecular states of $\bar D^{*}K^{*}$ ($ D^{*}K^{*}$) and the new exotic states $X_0(2900)$ and $X_1(2900)$ ($T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$)
论文作者
论文摘要
两个Iso-singlet强子状态$ x_0（2900）$和$ x_1（2900）$，分别为$ j = 0 $和1，由LHCB协作在2020年发现，被确定为$ \ bar d^*k^*$的分子界。最近，在Hadron Spectra上观察到了两个结构$ t^a_ {cs0}（2900）^0 $和$ t^a_ {cs0}（2900）^{++} $。只要它们具有$ d^*k^*$的分子结构，强子状态必须位于ISO-vector中，即$ t^a_ {cs0}（2900）（2900）^0 $和$ t^a_ {cs0}（cs0}（2900）（2900）^{++} $ $ i_3 = -1 $ 1，1 $ comptecter。如果是这种情况，则相应的$ t^a_ {cs0}（2900）^+$ of（$ i = 1，i_3 = 0 $）和$ t^{'a} _ {cs0}（2900）^{+} $ i = 0，i_3 = 0，I_3 = 0，I_3 = 0 $ she I_3 = 0 $，但应该从实验中找到实验。为了证明这一Ansatz，在本文中，我们研究了Bethe-Salpeter（B-S）框架中$ \ bar d^{*} k^{*} $和$ d^{*} $的分子结构。有了合理的输入参数，发现$ \ bar d^{*} k^{*} $ iso-scalar系统具有$ j^p = 0^+$，$ 1^+$是解决方案。结果支持$ x_0（2900）$（$ x_1（2900）$）的ansatz是$ \ bar d^*k^{*} $的分子状态。而对于$ d^{*}的系统，$ i = 1 $的k^{*} $，相应的b-s方程没有解决方案。因此，我们可以得出一个明确的结论：$ t^a_ {cs0}（2900）^0 $和$ t^a_ {cs0}（2900）^{++} $不应是$ d^{*} $和$ k^{*} $的限制状态。 LHCB协作观察到的两个结构可能是由动力学引起的，例如公认的三角形异常或其他机制。
Two iso-singlet hadron states $X_0(2900)$ and $X_1(2900)$ with $J=0$ and 1 respectively, discovered by the LHCb collaboration in 2020, were identified as molecular bound states of $\bar D^*K^*$. Recently two structures $T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ have been observed at the hadron spectra, one would suspect if they also are molecular states of $D^*$ and $K^*$. As long as they were of the molecular structures of $D^*K^*$, the hadron states must be in an iso-vector, namely $T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ were $I_3=-1, 1$ components of the iso-vector. If it is the case, the corresponding $T^a_{cs0}(2900)^+$ of ($I=1,I_3=0$) and $T^{'a}_{cs0}(2900)^{+}$ of $I=0,I_3=0$ so far evade experimental observation, but should be found by the future experiments. To testify this ansatz, in this paper we study the possible molecular structures of $\bar D^{*}K^{*}$ and $D^{*}K^{*}$ within the Bethe-Salpeter (B-S) framework. With reasonable input parameters it is found that $\bar D^{*}K^{*}$ iso-scalar systems with $J^P=0^+$ and $1^+$ are solutions. The result supports the ansatz of $X_0(2900)$ ($X_1(2900)$) being molecular states of $\bar D^*K^{*}$. Whereas for the system of $ D^{*}K^{*}$ with $I=1$ the corresponding B-S equation has no solution. Thus we can draw a clear conclusion that $T^a_{cs0}(2900)^0$ and $T^a_{cs0}(2900)^{++}$ should not be bound states of $ D^{*}$ and $K^{*}$. The two structures observed by the LHCb collaboration may be caused by dynamics, such as the well-recognized triangle anomalies or other mechanisms.
