Low-momentum hyperon-nucleon interactions

We present a first exploratory study for hyperon-nucleon interactions using renormalization group techniques. The effective two-body low-momentum potential V_lowk is obtained by integrating out the high-momentum components from realistic Nijmegen YN potentials. A T-matrix equivalence approach is employed, so that the low-energy phase shifts are reproduced by V_lowk up to a momentum scale Λ~500 MeV. Although the various bare Nijmegen models differ somewhat from each other, the corresponding V_lowk interactions show convergence in some channels, suggesting a possible model-independent YN interaction at low momenta.