Hidden-charm $udsc\bar{c}$ pentaquarks as flavor eigenstates in a constituent quark model

Abstract

We use a diffusion Monte Carlo (DMC) algorithm to solve the Schrödinger equation that describes $udsc\bar{c}$ pentaquarks within the framework of a non-relativistic constituent quark model. We considered only multiquark states with defined values of parity, color, spin and isospin, selected to be compatible with the experimentally favored assignment $J^P=1/2^{-}$ for one of the candidates, and assumed $I=0$. However, we found that, to explain the existence of the $P_{cs}(4338)$ and $P_{cs}(4459)$ pentaquarks, we need the total wavefunction to be also an eigenvector of the SU(3) {\em flavor} operator. When we impose that condition, we obtain two structures compatible with the masses extracted from the $J/\psi \Lambda$ spectrum. In addition, two states are predicted below the $J/\psi \Lambda$ threshold but above the ${\eta }_c\Lambda$ one that would not appear in that channel. If we only impose the $I=0$ condition, we obtain a {\em single} (not two) structure compatible with the experimental quantum numbers, with a mass below the $J/\psi \Lambda$ threshold.

Comments: Typo in the flavor of IIa structure corrected