DOI 10.1007/s100529900087
Strong-interaction effects in stop pair production
at e+ e- colliders
M. Drees1 - O.J.P. Éboli1,2
1 Instituto de Física Teórica , Universidade Estadual
Paulista,
Rua Pamplona 145, São Paulo, SP 01405-900, Brazil
2 Department of Physics, University of Wisconsin,
Madison, WI 53706, USA
Received: 19 February 1999 / Revised version: 12 March 1999 / Published online: 3 August 1999
Abstract
We discuss perturbative and non-perturbative strong-interaction
effects
in the pair production of stop squarks () at e+ e- colliders.
Events
with an additional hard gluon allow to detect or exclude production
even in scenarios with very small mass splitting between and an
invisible lightest supersymmetric particle (LSP). Such events
can also
help to establish that transforms as a triplet under
SU(3)
.We
also carefully study non-perturbative fragmentation, which
is
currently not well understood: not only is the fragmentation
function
not known very well, but also there are ambiguities in the algorithm
employed to model fragmentation. We present numerical results
both for
CERN LEP-183 and for a proposed future e+ e- collider operating
at
center-of-mass energy s1/2=500GeV.
Copyright Springer-Verlag
