Looking for a hidden-charm pentaquark state with strangeness $S=\ensuremath{-}1$ from ${\mathrm{\ensuremath{\Xi}}}_{b}^{\ensuremath{-}}$ decay into $J/\ensuremath{\psi}{K}^{\ensuremath{-}}\mathrm{\ensuremath{\Lambda}}$

Looking for a hidden-charm pentaquark state with strangeness $S = - 1$ from $Ξ_{b}^{-}$ decay into $J / ψ K^{-} Λ$

Hua-Xing Chen, Li-Sheng Geng, Wei-Hong Liang, Eulogio Oset, En Wang, and Ju-Jun Xie

Phys. Rev. C 93, 065203 – Published 14 June 2016

Abstract

Assuming that the recently observed hidden-charm pentaquark state, $P_{c} (4450)$ , is of molecular nature as predicted in the unitary approach, we propose to study the decay of $Ξ_{b}^{-} \to J / ψ K^{-} Λ$ to search for the strangeness counterpart of the $P_{c} (4450)$ . There are three ingredients in the decay mechanism: the weak decay mechanism, the hadronization mechanism, and the final state interactions in the meson-baryon system of strangeness $S = - 2$ and isospin $I = 1 / 2$ and of the $J / ψ Λ$ . All these have been tested extensively. As a result, we provide a genuine prediction of the invariant mass distributions where a strangeness hidden-charm pentaquark state, the counterpart of the $P_{c} (4450)$ , can be clearly seen. The decay rate is estimated to be of similar magnitude as the $Λ_{b}^{0} \to J / ψ K^{-} p$ measured by the LHCb Collaboration.

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Received 20 January 2016
Revised 11 May 2016

DOI:https://doi.org/10.1103/PhysRevC.93.065203

Physics Subject Headings (PhySH)

Particle & resonance production Particle decays

Baryons Exotic baryons

Nuclear PhysicsParticles & Fields

Authors & Affiliations

Hua-Xing Chen

School of Physics and Nuclear Energy Engineering and International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China and Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China

Li-Sheng Geng^*

School of Physics and Nuclear Energy Engineering and International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China; Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China; and State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

Wei-Hong Liang

Department of Physics, Guangxi Normal University, Guilin 541004, China

Eulogio Oset

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China and Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain

En Wang

Department of Physics, Zhengzhou University, Zhengzhou, Henan 450001, China

Ju-Jun Xie

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS and Lanzhou University, Lanzhou 730000, China; and State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China

^*lisheng.geng@buaa.edu.cn

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Vol. 93, Iss. 6 — June 2016

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Physical Review C

covering nuclear physics

Looking for a hidden-charm pentaquark state with strangeness $S = - 1$ from $Ξ_{b}^{-}$ decay into $J / ψ K^{-} Λ$

Hua-Xing Chen, Li-Sheng Geng, Wei-Hong Liang, Eulogio Oset, En Wang, and Ju-Jun Xie

Phys. Rev. C 93, 065203 – Published 14 June 2016

Abstract

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Physical Review C

covering nuclear physics

Looking for a hidden-charm pentaquark state with strangeness S=−1 from Ξb− decay into J/ψK−Λ

Hua-Xing Chen, Li-Sheng Geng, Wei-Hong Liang, Eulogio Oset, En Wang, and Ju-Jun Xie

Phys. Rev. C 93, 065203 – Published 14 June 2016

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Looking for a hidden-charm pentaquark state with strangeness $S = - 1$ from $Ξ_{b}^{-}$ decay into $J / ψ K^{-} Λ$