Hauptseite > Publikationsdatenbank > Interpretation of the LHCb P c States as Hadronic Molecules and Hints of a Narrow P c ( 4380 ) > print

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024 7 _ |a 10.1103/PhysRevLett.124.072001
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100 1 _ |a Du, Meng-Lin
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245 _ _ |a Interpretation of the LHCb P c States as Hadronic Molecules and Hints of a Narrow P c ( 4380 )
260 _ _ |a College Park, Md.
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520 _ _ |a Three hidden-charm pentaquark Pc states, Pc(4312), Pc(4440), and Pc(4457) were revealed in the Λ0b→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(*) molecular states in two spin multiplets, such that the Pc(4312) is mainly a Σc¯D bound state with JP=1/2−, while Pc(4440) and Pc(4457) are Σc¯D∗ bound states with quantum numbers 3/2− and 1/2−, respectively. We also show that there is evidence for a narrow Σ∗c¯D bound state in the data which we call Pc(4380), different from the broad one reported by LHCb in 2015. With this state included, all predicted Σc¯D, Σ∗c¯D, and Σc¯D∗ hadronic molecules are seen in the data, while the missing three Σ∗c¯D∗ states are expected to be found in future runs of the LHC or in photoproduction experiments.
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700 1 _ |a Oller, José A.
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700 1 _ |a Wang, Qian
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773 _ _ |a 10.1103/PhysRevLett.124.072001
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