Results from the KTeV experiment at Fermilab using neutral Xi hyperons are presented, especially the first form-factor (FF) measurement from its semi-leptonic decay. This decay, which is an important test of the Standard Model, was observed for the first time using the 1997 KTeV experiment. We also report on the analysis of a large samples of neutral Xi weak radiative decays, and a search for the decay of a lightly bound $H^0$ dibaryon.
Categories: hep-ex