Emergence of a Complete Heavy-Quark Spin Symmetry Multiplet: Seven Molecular Pentaquarks in Light of the Latest LHCb Analysis

DOI DOI Web Site Web Site PubMed 被引用文献8件 参考文献56件

書誌事項

公開日
2019-06-21
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0/
DOI
  • 10.1103/physrevlett.122.242001
  • 10.48550/arxiv.1903.11560
公開者
American Physical Society (APS)

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説明

A recent analysis by the LHCb collaboration suggests the existence of three narrow pentaquark-like states --- the $P_c(4312)$,$P_c(4440)$ and $P_c(4457)$ --- instead of just one in the previous analysis (the $P_c(4450)$). The closeness of the $P_c(4312)$ to the $\bar{D} ��_c$ threshold and the $P_c(4440)$/$P_c(4457)$ to the $\bar{D}^* ��_c$ one suggests a molecular interpretation of these resonances. We show that these three pentaquark-like resonances can be naturally accommodated in a contact-range effective field theory description that incorporates heavy-quark spin symmetry. This description leads to the prediction of all the seven possible S-wave heavy antimeson-baryon molecules (that is, there should be four additional molecular pentaquarks in addition to the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$), providing the first example of a heavy-quark spin symmetry molecular multiplet that is complete. If this is confirmed, it will not only give us an impressive example of the application of heavy-quark symmetries and effective field theories in hadron physics: it will also uncover a clear and powerful ordering principle for the molecular spectrum, reminiscent of the SU(3)-flavor multiplets to which the light hadron spectrum conforms.

Corresponds to the version to be published in Physical Review Letters; 4 pages, 1 table summarizing the results, the names of the scenarios have been exchanged to reflect their theoretical preference (scenario A now corresponds to the more likely scenario in pionless EFT)

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