PccN states in a unitarized coupled-channel approach

Starting from an effective Lagrangian with heavy quark spin symmetry embedded, the coupled-channel dynamics of the doubly charmed systems D-(*) Sigma((*))(c) is investigated. The potential underlying our investigation includes t-channel pseudoscalar and vector meson exchanges. A series of S-wave bound states with isospin I = 1/2 is found by applying the first iterated solution of the N/ D method: one state with binding energy 23 MeV in the 5/2- D* Sigma(c)* channel, three states with binding energy 26, 30 and 7MeV (relative to the thresholds from low to high, respectively) in the 3/2(-) D Sigma(c)* - D*Sigma(c)- D*Sigma(c)* system and three states with binding energy 32, 8 and 16MeV in the 1/2(-) D Sigma(c)- D*Sigma(c)- D*Sigma(c)* c system. Those P-cc(N) states serve as the open-charm partners of the hidden charm pentaquarks P-psi(N) observed by the LHCb Collaboration.

Automated summary

Using an effective Lagrangian with heavy quark spin symmetry, this study investigates the coupled-channel dynamics of the doubly charmed systems D-(*) Sigma((*))(c). The potential considered includes exchanges of pseudoscalar and vector mesons in the t-channel. By applying the first iterated solution of the N/ D method, several S-wave bound states with isospin I = 1/2 are discovered. These states correspond to open-charm partners of the hidden charm pentaquarks P-psi(N) observed by the LHCb Collaboration.