  Recent results from the KTeV experiment at Fermilab using $\Xi^0$ hyperons
have enabled a great leap in improving our understanding of elementary particle
physics, especially with the first form-factor measurement from the
semi-leptonic decay $\Xi^0 \to \Sigma^+ e^- \bar{\nu}$. This decay is a test of
whether the standard model contains all of the needed parameters to fully
describe hyperon beta decay. It was observed for the first time only in 1997
even though its importance had been explicitly stated in 1961 by the early
theories of the standard model as formulated by N. Cabibbo. We have the ability
to improve this measurement substantially by making the definitive form-factor
measurement with a sample of 30,000 such decays from a forthcoming experiment,
which will either show or rule out the existence any additional second class
weak currents, an obviously important measurement allowing particle physics to
finally put this question to rest. We also have the ability to make a
measurement of hyperon compositeness by measuring the charged $\Sigma^{\pm}$
beta decay into $\Lambda^0$, and in addition to search for mass coupling terms
in hyperon beta decays where the muon replaces the electron, important for
determining the $g_3$ and $f_3$ form-factors. These are the important questions
to answer in studying strange baryon decays, and are reviewed in this article.

High Energy Physics - Experiment