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arXiv · 1803.11369

Quark model estimate of hidden-charm pentaquark resonances

Emiko Hiyama·Atsushi Hosaka·Makoto Oka·Jean-March Richard
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Abstract

A quark model, which reproduces the ground-state mesons and baryons, i.e., the threshold energies, is applied to the $qqqc\bar c$ configurations, where $q$ is a light quark and~$c$ the charmed quark. In the calculation, several open channels are explicitly included such as $\Jpsi +N$, $η_c+N$, $Λ_c +D$, etc. To distinguish genuine resonances and estimate their width, we employ Gaussian Expansion Method supplemented by the real scaling method (stabilization). No resonance is found at the energies of the $P_c(4380)$ and $P_c(4450)$ pentaquarks. On the other hand, there is a sharp resonant state at 4690\,MeV with $J=1/2^-$ state and another one at 4920\,MeV with $J=3/2^-$ state, which have a compact structure.

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Emiko Hiyama, Atsushi Hosaka, Makoto Oka, Jean-March Richard. 2018-03-30. Quark model estimate of hidden-charm pentaquark resonances. https://doi.org/10.1103/physrevc.98.045208

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