X 0 (2900) and X 1 (2900): Hadronic Molecules or Compact Tetraquarks

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 fe...

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Bibliographic Details
Published in:Chinese physics letters 2020-10, Vol.37 (10), p.101201
Main Authors: Chen, Hua-Xing, Chen, Wei, Dong, Rui-Rui, Su, Niu
Format: Article
Language:English
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Summary: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 c ¯ s ¯ u d compact tetraquark state of J P = 1 − . Mass predictions of their bottom partners are also given.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/37/10/101201