Production of hidden-charm strange pentaquarks Pcs from the K−p→J/ψΛ reaction

Samson Clymton,Hee-Jin Kim,Hyun-Chul Kim

doi:10.1103/physrevd.104.014023

Samson Clymton, Hee-Jin Kim + Show 1 more

Open Access

https://doi.org/10.1103/physrevd.104.014023

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Abstract

We investigate the production of the hidden-charm pentaquark $P_{cs}^0(4459)$ with strangeness in the $K^- p \to J/\psi \Lambda$ reaction, employing two different theoretical frameworks, i.e., the effective Lagrangian method and the Regge approach. Having determined all relevant coupling constants, we are able to compute the total and differential cross sections for the $K^- p \to J/\psi \Lambda$ reaction. We examine the contributions of $P_{cs}$ with different sets of spin-parity quantum number assigned. The present results may give a guide for possible future experiments.

Highlights

Very recently, the LHCb Collaboration has announced the finding of a new hidden-charm pentaquark state with strangeness in the analysis of Ξ−b → J=ψΛK− decays [1]
We investigate the production of the hidden-charm pentaquark P0csð4459Þ with strangeness in the K−p → J=ψΛ reaction, employing two different theoretical frameworks, i.e., the effective Lagrangian method and the Regge approach
We examine the contributions of Pcs with different sets of spin-parity quantum number assigned

Summary

INTRODUCTION

The LHCb Collaboration has announced the finding of a new hidden-charm pentaquark state with strangeness in the analysis of Ξ−b → J=ψΛK− decays [1]. While the quark content of P0csð4459Þ can be given as udscc, its spin-parity quantum number is not known yet because of lack of the data This finding broadens our understanding of how the quarks form multiquark hadrons in addition to the heavy pentaquark baryons Pc [2,3,4] and many charmoniumlike tetraquark mesons [5,6] (see recent experimental and theoretical reviews [7,8,9,10,11]). We investigate the production of P0csð4459Þ in the K−p → J=ψ Λ reaction, based on two different theoretical models, i.e., the effective Lagrangian method and Regge approach. The present work will provide helpful guidance on possible future experiments at the J-PARC and on determining the spin-parity quantum number of Pcs. We sketch the present work as follows: In Sec. II, we explain the general formalism for the effective Lagrangian and Regge approaches. We summarize the present work and will draw conclusions

Effective Lagrangian method

Regge approach

K and KÃ Reggeon exchange

N Reggeon exchange

RESULTS AND DISCUSSION

SUMMARY AND CONCLUSION