Quark Pauli effects on the binding energies of s-shell Lambda hypernuclei

The binding energies of s-shell hypernuclei are calculated using the stocha stic variational method. It is shown that the Pauli principle at the quark level brings about a special constraint on the dynamics of hypernuclei. Whe n the constraint is taken into account consistently with the quark confinem ent, the predicted Lambda separation energy of He-5(Lambda) is significantl y reduced for a baryon size of 0.86 fm, while it is unchanged for 0.6 fm. E ffective Lambda N central potentials used in the present analysis reproduce the excitation energies of the H-4(Lambda)-(4)(Lambda) He isodoublet.