The Strangeness-exchange Reaction K¯d ? App¯ in FIight

Abstract

The data on the forward reaction K -d --> Apn- at 700 MeV/c are compared with calculations using semi-phenomenological one-boson-exchange hyperon-nucleon potentials and KN --> nY amplitudes deduced from two-body data. This gives a new test of these potentials, since only the spin-triplet potentials are involved, in contrast with all other scattering data, which depend on a spin-weighted average of singlet and triplet contributions. However, this comparison does not yet provide an empirical distinction between Potential! of Brown et al. (1970) and Potential F of Nagels et al. (1979). The KN --> nI: and KN --> nA amplitudes interfere in this reaction, so that its analysis can yield new knowledge of them; the present work requires a phase for the KN --> nA amplitude different by about - 135� from that deduced from partial-wave analyses.