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At future e+- e- linear
colliders, the event rates and clean signals of scalar fermion
production - in particular for the scalar leptons - allow very precise
measurements of their masses and couplings and the determination of
their quantum numbers. Various methods are proposed for extracting these
parameters from the data at the sfermion thresholds and in the
continuum. At the same time, NLO radiative corrections and non-zero
width effects have been calculated in order to match the experimental
accuracy. The substantial mixing expected for the third generation
sfermions opens up additional opportunities. Techniques are presented
for determining potential CP-violating phases and for extracting
tan(beta) from the stau sector, in particular at high values. The
consequences of possible large mass differences in the stop and sbottom
system are explored in dedicated analyses.
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