Folding procedure for $Ω$-$α$ potential

Abstract

Using the folding procedure, we investigate the bound state of the $Ω$+$α$ system based on $Ω$-$N$ ($^{5}S_{2}$) HAL QCD potential. Previous theoretical analyses have indicated the existence of a deeply bound ground state, which is attributed to the strong $Ω$-nucleon interaction. By employing well-established parameterizations of nucleon density within the alpha particle, and the central HAL QCD $Ω$-$N$ potential, we performed numerical calculations for the folding $Ω$-$α$ potential. Our results show that the $V_{Ωα}(r)$ potential can be accurately fitted using a Woods-Saxon function, with a phenomenological parameter $R = 1.1A^{1/3} \approx 1.74$ fm ($A=4$) in the asymptotic region where $2 < r < 3$ fm. We provide a thorough description of the corresponding numerical procedure. Our evaluation of the binding energy of the $Ω$+$α$ system within the cluster model is consistent with both previous and recent reported findings. To further validate the folding procedure, we also calculated the $Ξ$-$α$ folding potential based on a simulation of the ESC08c $Y$-$N$ Nijmegen model. A comprehensive comparison between the $Ξ$-$α$ folding and $Ξ$-$ α$ phenomenological potentials is presented and discussed.