Symmetry selection rules restrict nucleon-pentaquark mixing to 6 of 27 positive-parity states, with sigma and pi transitions adding incoherently to a total five-quark probability of 29%.
Micu, Nucl
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Node-induced cancellations in the relativistic decay amplitude suppress the D D-bar width of ψ(4040) while leaving D D* and D_s D_s-bar channels sizable.
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Chiral Structure and Selection Rules in Light-Front Nucleon-Pentaquark Mixing
Symmetry selection rules restrict nucleon-pentaquark mixing to 6 of 27 positive-parity states, with sigma and pi transitions adding incoherently to a total five-quark probability of 29%.
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Nodal mechanism for the suppressed $D\bar D$ decay of $\psi(4040)$ in the Bethe--Salpeter framework
Node-induced cancellations in the relativistic decay amplitude suppress the D D-bar width of ψ(4040) while leaving D D* and D_s D_s-bar channels sizable.