Investigation of the strange pentaquark candidate ${P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}$ recently observed by LHCb

The recently observed strange pentaquark candidate, ${P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}$, is investigated to provide information about its nature and substructure. To this end, its mass and width through the decay channels ${P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}\to J/\psi \Lambda $ and ${P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}\to {\eta }_{c}\Lambda $ are calculated by applying two- and three-point QCD sum rules, respectively. The state is considered as a ${\Xi }_{c}\overline{D}$ meson-baryon molecular structure with spin-parity quantum numbers ${J}^{P}={\frac{1}{2}}^{-}$. The obtained mass, ${m}_{{P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}}=4338±130\text{}\text{}\mathrm{MeV}$, and width, ${\Gamma }_{{P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}}=10.40±\phantom{\rule{0ex}{0ex}}1.93\text{}\text{}\mathrm{MeV}$, are consistent with the experimental data within the presented uncertainties. This allows us to assign a ${\Xi }_{c}\overline{D}$ molecular structure of ${J}^{P}={\frac{1}{2}}^{-}$ for the ${P}_{\psi s}^{\Lambda }\left(4338{\right)}^{0}$ state.