| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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$X_0(2900)$ and $X_1(2900)$: Hadronic Molecules or Compact Tetraquarks |
| Hua-Xing Chen1*, Wei Chen2*, Rui-Rui Dong3, and Niu Su3 |
1School of Physics, Southeast University, Nanjing 210094, China
2School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
3School of Physics, Beihang University, Beijing 100191, China
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| Cite this article: |
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Hua-Xing Chen, Wei Chen, Rui-Rui Dong et al 2020 Chin. Phys. Lett. 37 101201 |
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Abstract Very recently the LHCb collaboration reported their observation of the first two fully open-flavor tetraquark states, the $X_0(2900)$ of $J^P = 0^+$ and the $X_1(2900)$ of $J^P = 1^-$. We study their possible interpretations using the method of QCD sum rules, paying special attention to an interesting feature of this experiment that the higher resonance $X_1(2900)$ has a width significantly larger than the lower one $X_0(2900)$. Our results suggest that the $X_0(2900)$ can be interpreted as the s-wave $D^{*-}K^{*+}$ molecule state of $J^P = 0^+$, and the $X_1(2900)$ can be interpreted as the p-wave $\bar c \bar s u d$ compact tetraquark state of $J^P = 1^-$. Mass predictions of their bottom partners are also given.
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Received: 02 September 2020
Published: 25 September 2020
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| PACS: |
12.38.Lg
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(Other nonperturbative calculations)
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11.40.-q
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(Currents and their properties)
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12.39.Mk
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(Glueball and nonstandard multi-quark/gluon states)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11722540 and 12075019), and the Fundamental Research Funds for the Central Universities. |
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