Interpretation of the LHCb P_{c} States as Hadronic Molecules and Hints of a Narrow P_{c}(4380)

Physical Review Letters
Meng-Lin DuQian Wang

Abstract

Three hidden-charm pentaquark P_{c} states, P_{c}(4312), P_{c}(4440), and P_{c}(4457) were revealed in the Λ_{b}^{0}→J/ψpK^{-} process measured by LHCb using both run I and run II data. Their nature is under lively discussion, and their quantum numbers have not been determined. We analyze the J/ψp invariant mass distributions under the assumption that the crossed-channel effects provide a smooth background. For the first time, such an analysis is performed employing a coupled-channel formalism with the scattering potential involving both one-pion exchange as well as short-range operators constrained by heavy quark spin symmetry. We find that the data can be well described in the hadronic molecular picture, which predicts seven Σ_{c}^{(*)}D[over ¯]^{(*)} molecular states in two spin multiplets, such that the P_{c}(4312) is mainly a Σ_{c}D[over ¯] bound state with J^{P}=1/2^{-}, while P_{c}(4440) and P_{c}(4457) are Σ_{c}D[over ¯]^{*} bound states with quantum numbers 3/2^{-} and 1/2^{-}, respectively. We also show that there is evidence for a narrow Σ_{c}^{*}D[over ¯] bound state in the data which we call P_{c}(4380), different from the broad one reported by LHCb in 2015. With this state included, all predicted Σ_{c}D[over ¯], Σ...Continue Reading

References

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Jul 15, 2003·Physical Review Letters·B AubertUNKNOWN BABAR Collaboration
Feb 3, 2004·Physical Review Letters·S-K ChoiUNKNOWN Belle Collaboration
Sep 1, 2015·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration
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Mar 3, 2017·Reports on Progress in Physics·Hua-Xing ChenShi-Lin Zhu
Sep 7, 2019·Physical Review Letters·A AliUNKNOWN GlueX Collaboration
Sep 17, 2019·Physical Review Letters·C Fernández-RamírezUNKNOWN Joint Physics Analysis Center

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Citations

May 1, 2021·Physical Review Letters·Xiang-Kun DongBing-Song Zou
Apr 22, 2021·Reports on Progress in Physics·De-Liang YaoZhi-Yong Zhou

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