Production mechanism of hidden-charm pentaquark states Pccs with strangeness S =-1

초록

We investigate the hidden-charm pentaquark states with strangeness S 1/4-1 (Pccs) within an off shell coupled-channel approach based on effective Lagrangians that respect heavy-quark spin symmetry, SU(3) flavor symmetry, and hidden local symmetry. All relevant meson-baryon two-body channels composed of low-lying anticharmed mesons and singly charmed baryons with S 1/4-1, as well as the J/jrA channel, are included. We find a total of 11 negative-parity states and three positive-parity states. Among the negative-parity states, the Pccs(4338) and Pccs(4459) can possibly be interpreted as DEc and D c molecular states, respectively. We identify a second state, Pccs(4472), located close to the Pccs(4459) but with different spin and width, which may correspond to the structure observed by the Belle Collaboration. Both states are generated from the D c channel and can be interpreted as spin partners. Their properties are consistent with recent experimental observations, providing strong support for the molecular interpretation of the Pccs states. We also observe a two-pole structure near the DsAc and DE0c thresholds, and find virtual and resonance states in the Dc channel depending on spin-parity.

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