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arXiv 2009.14538hep-ph
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$S-$波$\bar D^\ast K^\ast$强子分子衰变的研究:标量$X_0(2900)$及其自旋伴体$X_{J(J=1,2)}$

A study of the decays of $S-$wave $\bar D^\ast K^\ast$ hadronic molecules: the scalar $X_0(2900)$ and its spin partners $X_{J(J=1,2)}$

Cheng-Jian Xiao, Dian-Yong Chen, Yu-Bing Dong, Guang-Wei Meng

摘要:

在本工作中,我们研究了LHCb合作组最近观测到的完全开味四夸克态$X_0(2900)$的衰变。在这里,$X_0(2900)$被指定为一个$S-$波$\bar D^\ast K^\ast$强子分子与$I=0$,并应用有效拉格朗日方法估计的部分衰变宽度。此外,我们还预测了其他未观察到的$X_{J(J=1,2)}$的衰变行为,这是$X_0(2900)$的自旋伙伴的$S-$波$\bar D^\ast K^\ast$图片。指出含$I=0$的$X_1$态是宽度大于100 MeV的宽态,而含$I=0$的$X_2$态是宽度接近$X_0(2900)$的一半的窄态.此外,我们的研究结果还表明,$\bar D^\ast K$模式预计是占主导地位的衰减模式的$X_1$和$X_2$。在以后的实验中寻找那些未观察到的$X_{J(J=1,2)}$可能有助于理解$X_0(2900)$的本质。

英文摘要:

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 $X_0(2900)$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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