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Decoding the nature of the pentaquark states from LHCb

Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany

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Vadim Baru

Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany

Institute for Theoretical and Experimental Physics, B. Cheremushkinskaya 25, 117218 Moscow, Russia

P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 119991, Leninskiy Prospect 53, Moscow, Russia

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Feng-Kun Guo

CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Zhong Guan Cun East Street 55, Beijing 100190, China

School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

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Christoph Hanhart

Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany

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Ulf-G. Meißner

Helmholtz-Institut für Strahlen- und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany

Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany

Tbilisi State University, 0186 Tbilisi, Georgia

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José A. Oller

Departamento de Física, Universidad de Murcia, E-30071 Murcia, Spain

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Qian Wang

Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China

Theoretical Physics Center for Science Facilities, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

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https://doi.org/10.1142/9789811219313_0045Cited by:0 (Source: Crossref)

Abstract:

The updated analysis of LHCb of the $Λ_{b}^{0} \to J / ψ p K^{-}$ process with an order of magnitude larger data sample led to three narrow pentaquark states, i.e. P_c(4312), P_c(4440) and P_c(4457). We analyze the measured J/ψp invariant mass distribution by solving the Lippmann-Schwinger equation with both the dynamical $Σ^{(*)} {\bar{D}}^{(*)}$ and J/ψp channels under the assumption that the crossed-channel effects provide a smooth incoherent background. We find that the data can be well described in the hadronic molecular picture, which predicts seven $Σ^{(*)} {\bar{D}}^{(*)}$ molecular states. In particular, we show that there is evidence in the data for an additional narrow $Σ_{c}^{*} \bar{D}$ bound state, which is different from the broad one reported by LHCb in 2015.

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Hadron Spectroscopy and Structure

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Decoding the nature of the pentaquark states from LHCb

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