What question did this study set out to answer?

This work aims to analyze hidden-charm pentaquark candidates by distinguishing their isospin and investigating their mass spectrum using QCD sum rules.

March 4, 2026The European Physical Journal C0 citationsOpen Access

Analysis of the hidden-charm pentaquark candidates in the J/ p mass spectrum with QCD sum rules

ZWZhi-Gang Wang

Key Points

This work aims to analyze hidden-charm pentaquark candidates by distinguishing their isospin and investigating their mass spectrum using QCD sum rules.
Constructed diquark–diquark–antiquark five-quark currents with isospin I=1/2.
Systematically studied the uudc̄c pentaquark states using QCD sum rules.
Obtained mass spectrum for diquark–diquark–antiquark type states.
Identified mass spectrum of uudc̄c pentaquark states with isospin-spin-parity IJ^P={1/2, 1/2}^- and I={1/2, 3/2}^- and {1/2, 5/2}^- classifications.
Proposed assignments for known pentaquark states such as P_c(4312) and P_c(4440).

Abstract

Abstract In this work, we distinguish the isospin unambiguously to construct the diquark–diquark–antiquark type five-quark currents with the isospin I=1/2 I = 1 / 2, and study the uudcc u u d c c ¯ pentaquark states with the QCD sum rules systematically for the first time. Then we obtain the mass spectrum of the diquark–diquark–antiquark type uudcc u u d c c ¯ pentaquark states with the isospin-spin-parity IJP=121{2}^- I J P = 1 2 1 2 -, 123{2}^- 1 2 3 2 - and 125{2}^- 1 2 5 2 -, and make possible assignments of the Pc (4312) P c (4312), Pc (4337) P c (4337), Pc (4380) P c (4380), Pc (4440) P c (4440)

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