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Abstract: We investigate the possible existence of triple-strangeness hidden-charm pentaquark states in the off-shell coupled-channel formalism. The open-charm meson-baryon (D) over bar (s)Omega(c), (D) over bar (s)Omega(c)*, (D) over bar (s)*Omega(c), and (D) over bar (s)*Omega(c)* channels are considered, together with the hidden-charm J/psi Omega channel. The two-body kernel Feynman amplitudes are constructed from an effective Lagrangian based on hidden local symmetry and heavy-quark spin symmetry. The coupled Blankenbecler-Sugar equation is solved in the partial-wave helicity basis. We observe two triple-strangeness hidden-charm pentaquark states: P-c (c) over bar sss(4787) and P-c (c) over bar sss(4841), both with J(P) = 1/2(-). The P-c (c) over bar sss(4787) couples dominantly to the (D) over bar (s)*Omega(c) and (D) over bar (s)*Omega(c)* channels, while the P-c (c) over bar sss(4841) couples almost exclusively to the (D) over bar (s)*Omega(c) channel. The total transition cross sections of (D) over bar (()(s)*())Omega(()(c)*()) -> J/psi Omega indicate that the P-c (c) over bar sss(4787) is clearly visible in the J/psi Omega invariant mass spectrum, whereas the P-c (c) over bar sss(4841) is obscured by cusp structures and background contributions.

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