DOI: 10.1140/epja/i2002-10060-6
String model description of polarisation
and angular distributions in
at low energies
S. 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)
Abstract
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