A meson exchange model for the hyperon-nucleon interaction

Jülich hyperon-nucleon model revisited

“…Note that as in Ref. [1] and in line with the arguments brought forth in Ref. [2] we neglect again the contribution from η meson exchange.…”

“…[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.…”

“…Following the philosophy of the original Jülich YN potential [1] the coupling constants in the pseudoscalar sector are fixed by strict SU(6) symmetry. In any case, this is also required for being consistent with the model of correlated ππ and KK exchange.…”

“…Furthermore, in the charged channels the Coulomb potential is taken into account. Since we solve the Lippmann-Schwinger equation in momentum space this is done by means of the Vincent-Phatak method [1,52].…”

“…Assuming the SU(6) symmetry means that also the so-called F /(F + D) ratios are fixed. In addition, there are further new ingrediations as compared to the original Jülich YN model [1]. First of all, the contribution from the a 0 (980) meson is taken into account.…”