Structure of single-Λ hypernuclei with chiral hyperon-nucleon potentials

The structure of single-Lambda hypernuclei is studied using the chiral hyperon-nucleon potentials derived at leading order (LO) and next-to-leading order (NLO) by the Julich-Bonn-Munich group. Results for the separation energies of Lambda single-particle states for various hypernuclei from Lambda 5He to mml:mspace width=0.166667emmml:mspace mml:mspace width=0.166667emmml:mspace mml:mspace width=0.166667em mml:mspace mml:mspace width=0.166667emmml:mspace mml:mspace width=0.166667em mml:mspace Lambda 209Pb are presented for the LO interaction and the 2013 (NLO13) and 2019 (NLO19) versions of the NLO potentials. It is found that the results based on the LO potential show a clear tendency for overbinding while those for the NLO13 interaction underbind most of the considered hypernuclei. A qualitatively good agreement with the data is obtained for the NLO19 interaction over a fairly large range of mass number values when considering the uncertainty due to the regulator dependence. A small spin-orbit splitting of the p-, d-, f-, and g-wave states is predicted by all interactions, in line with the rather small values observed in pertinent experiments.