Revisiting hidden-charm pentaquarks from QCD sum rules

Abstract

We revisit the hidden-charm pentaquark states $P_c(4380)$ and $P_c(4450)$ using the method of QCD sum rules by requiring the pole contribution to be larger than or around 30\% to better insure the one-pole parametrization to be valid. We find two mixing currents and our results suggest that the $P_c(4380)$ and $P_c(4450)$ can be identified as hidden-charm pentaquark states having $J^P=3/2^{-}$ and $5/2^{+}$, respectively, while there still exist other possible spin-parity assignments, such as $J^P=3/2^{+}$ and $J^P=5/2^{-}$, which needs to be clarified in further theoretical and experimental studies.

11 pages, 5 figures, published in CPC

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• Investigation of magnetic moment of $P_{cs}(4338)$ and $P_{cs}(4459)$ pentaquark states
• Decay behaviors of possible ${\Lambda }_{c\bar{c}}$ states in hadronic molecule pictures
• Hidden charm pentaquarks with color-octet substructure in QCD Sum Rules
• Exploring possible triangle singularities in the ${\Xi }_b^{-}\to K^{-}J/\psi \Lambda$ decay
• Hidden-charm pentaquark states through the current algebra: From their productions to decays
• Decay properties of $P_c$ states through the Fierz rearrangement
• Strange pentaquark molecules in QCD sum rules
• Exotic hadrons associated with $b$-quark