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Double-strangeness hidden-charm pentaquarks

Samson Clymton1,*, Hyun-Chul Kim2,3,4,†, and Terry Mart5,‡

  • *Contact author: samson.clymton@apctp.org
  • †Contact author: hchkim@inha.ac.kr
  • ‡Contact author: terry.mart@sci.ui.ac.id
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Phys. Rev. D 112, 034015 – Published 21 August, 2025

DOI: https://doi.org/10.1103/gy7h-9dt5

Abstract

We investigate the possible existence of double-strangeness hidden-charm pentaquark states, denoted as Pcc¯ss, within an off-shell coupled-channel formalism. Eleven meson–baryon channels with total strangeness S=−2 are constructed by combining charmed mesons and singly charmed baryons. The two-body scattering amplitudes are derived from an effective Lagrangian that respects heavy-quark spin symmetry, hidden local symmetry, and flavor SU(3) symmetry. The Bethe-Salpeter equation is solved using the Blankenbecler-Sugar reduction scheme, and resonances are identified as poles in the scattering amplitudes on the complex energy plane. We find five negative-parity Pcc¯ss states with spins J=1/2, 3/2, and 5/2, all located below their relevant thresholds. Three positive-parity states are also found: two with J=1/2 and one with J=3/2, lying above the thresholds with substantial widths. The coupling strengths of each resonance to relevant meson-baryon channels are extracted. The sensitivity of the results to the cutoff parameter Λ0=Λ−m is examined. These results provide theoretical predictions that may assist future experimental searches for Pcc¯ss states in the J/ψΞ channel.

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Phys. Rev. D 112, 034015– Published 21 August, 2025
  • Received 1 July 2025
  • Accepted 30 July 2025
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