String model description of polarisation and angular distributions in at low energiesS. Pomp, G. Ingelman, T. Johansson and S. Ohlsson
Department of Radiation Sciences, Uppsala University, Box 535, S-75121 Uppsala, Sweden Stephan.Pomp@tsl.uu.se
(Received: 2 April 2002 / Revised version: 8 July 2002 / Published online: 3 December 2002)
The observed polarisation of hyperons from the inclusive reaction at high energies has previously been well described within the Lund string model through polarised quark pair production in the string breaking hadronisation process. This model is here applied to the exclusive reaction at low energies and compared to available data sets down to an incident-beam momentum of 1.835 GeV/ c. This required an extension of the diquark scattering model to involve three components: an isotropic part relevant close to the threshold, a spectator part and a forward-scattering part as in at high energies. The observed angular distributions are then reproduced and, for momentum transfers above |t'| = 0.2 GeV 2, agreement with the measured polarisation is also obtained.
13.88.+e - Polarization in interactions and scattering.
14.20.Jn - Hyperons.
© Società Italiana di Fisica, Springer-Verlag 2002