${\mathrm{\ensuremath{\Lambda}}}_{b}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{0}\mathrm{\ensuremath{\Lambda}}$ reaction and a hidden-charm pentaquark state with strangeness

$Λ_{b} \to J / ψ K^{0} Λ$ reaction and a hidden-charm pentaquark state with strangeness

Jun-Xu Lu, En Wang, Ju-Jun Xie, Li-Sheng Geng, and Eulogio Oset

Phys. Rev. D 93, 094009 – Published 10 May 2016

Abstract

We study the $Λ_{b} \to J / ψ K^{0} Λ$ reaction considering both the $K^{0} Λ$ interaction with its coupled channels and the $J / ψ Λ$ interaction. The latter is described by taking into account the fact that there are predictions for a hidden-charm state with strangeness that couples to $J / ψ Λ$ . By using the coupling of the resonance to $J / ψ Λ$ from these predictions, we show that a neat peak can be observed in the $J / ψ Λ$ invariant mass distribution, rather stable under changes of unknown magnitudes. In some cases, one finds a dip structure associated to that state, but a signal of the state shows up in the $J / ψ Λ$ spectrum.

Received 13 January 2016

DOI:https://doi.org/10.1103/PhysRevD.93.094009

Physics Subject Headings (PhySH)

Hadronic decays

Exotic baryons Hyperons

Particles & Fields

Authors & Affiliations

Jun-Xu Lu¹, En Wang^2,*, Ju-Jun Xie^3,4,5,†, Li-Sheng Geng^1,5,‡, and Eulogio Oset^3,6,§

¹School of Physics and Nuclear Energy Engineering and International Research Center for Nuclei and Particles in the Cosmos, Beihang University, Beijing 100191, China
²Department of Physics, Zhengzhou University, Zhengzhou, Henan 450001, China
³Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
⁴Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS and Lanzhou University, Lanzhou 730000, China
⁵State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
⁶Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain

^*wangen@zzu.edu.cn
^†xiejujun@impcas.ac.cn
^‡lisheng.geng@buaa.edu.cn
^§Eulogio.Oset@ific.uv.es

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Vol. 93, Iss. 9 — 1 May 2016

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Physical Review D

covering particles, fields, gravitation, and cosmology

$Λ_{b} \to J / ψ K^{0} Λ$ reaction and a hidden-charm pentaquark state with strangeness

Jun-Xu Lu, En Wang, Ju-Jun Xie, Li-Sheng Geng, and Eulogio Oset

Phys. Rev. D 93, 094009 – Published 10 May 2016

Abstract

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Physical Review D

covering particles, fields, gravitation, and cosmology

Λb→J/ψK0Λ reaction and a hidden-charm pentaquark state with strangeness

Jun-Xu Lu, En Wang, Ju-Jun Xie, Li-Sheng Geng, and Eulogio Oset

Phys. Rev. D 93, 094009 – Published 10 May 2016

Abstract

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$Λ_{b} \to J / ψ K^{0} Λ$ reaction and a hidden-charm pentaquark state with strangeness