Theoretical investigations of reactions with strange particles

Role of correlated two-pion exchange in K+N scattering

“…Finally, Table 3 presents scattering lengths a I In the σ-channel, the result can be suitably represented by an exchange of a scalar particle with a mass of 0.75 GeV. The strength turns out to be in rough agreement with the strength of phenomenological σ-exchange used before [1], which has been adjusted, together with other diagrams, to empirical K + N data.…”

“…Recently [1] we have presented a meson exchange model for the K + N interaction, which provides a reasonable description of the empirical K + N scattering data for laboratory momenta smaller than 0.8 GeV/c. For model B of Ref.…”

“…For model B of Ref. [1] the diagrams included are shown in Figs. 1(a) and 1(b); they have been evaluated in time-ordered perturbation theory.…”

Hadron spectroscopy with instanton induced quark forces

“…Also the splitting between the aPo-state (fo-and ao-meson) and the other 3P-states cannot be described by the present model. It should however be noted, that there are indications that these mesons are to be understood in terms of meson-meson states rather than in terms of q~-configurations [29,30]. Also the A-and Q-spectra can be computed from the confinement potential alone with, apart from a different energy offset aq3, the very same parameters.…”

Faddeev Calculation of the K−d →πΣn Reaction in the Λ(1405) Resonance Region

“…The Jülich meson-exchange model of the KN and KN interactions has been described in detail in the literature [21][22][23][24] and we refer the reader to those works. The interaction model was constructed along the lines of the (full) Bonn N N model [19] and its extension to the hyperonnucleon (Y N ) system [20] (Y = Λ, Σ).…”