Journal Article

FZJ-2020-01215

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interpretation of the LHCb P c States as Hadronic Molecules and Hints of a Narrow P c ( 4380 )

Du, M.-L.Extern* ; Baru, V. ; Guo, F.-K.Extern* ; Hanhart, C.FZJ* ; Meißner, U.-G.FZJ* ; Oller, J. A. ; Wang, Q. (Corresponding author)

2020
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/24568  doi:10.1103/PhysRevLett.124.072001

Abstract: 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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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2020

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