Meson-exchange hyperon-nucleon interactions in free scattering and nuclear matter

Jülich hyperon-nucleon model revisited

“…In this context we want to mention that the static version of the old Jülich YN model [2] did not support a hypertriton bound state [40]. However, in that model both the 1 S 0 as well as the 3 S 1 N scattering lengths are considerably smaller [2] than in our new YN model.…”

“…[1] and in line with the arguments brought forth in Ref. [2] we neglect again the contribution from η meson exchange. In the full Bonn NN model the ηNN coupling constant was set to zero.…”

“…[23] that the ω exchange in the full Bonn NN potential represents not only the genuine SU(3) ω but is also an effective parametrization of additional short-range contributions from correlated π − ρ exchange, say, that are not included explicitly in that model. Therefore, in the Bonn NN model the required NN ω coupling constant is indeed much larger than what follows from the SU(3) relations and this large coupling constant formed also the basis for fixing the Y Y ω coupling constants of the old Jülich YN model [1,2], cf. the discussion in Sec.…”

“…(4.7) of Ref. [2]. Note that the potential matrix elements V i,j are derived by assuming isospin symmetry.…”

“…Figure 10 contains differential cross sections, polarizations, and the depolarization parameter D nn (definition and explicit expressions for those observables can be found in the Appendix B of Ref. [2]) for the N channel. We present predictions at two energies, one (p lab = 150 MeV/c) close to 044005-10 the N threshold and one (p lab = 600 MeV/c) close to (but below) the N threshold.…”