The Search for Cp Violation in Hyperon Decays

Searches for experimental manifestations of CP violation have born much fruit in recent years with the discovery of direct CP violation and the first evidence of CP violation outside of the neutral kaon system. Nevertheless we still know little about CP violation: its origin remains a mystery and there is little hard evidence that it is the sole province of the standard model. Searches for CP violation in hyperon decays offer promising possibilities as they are sensitive to certain beyondthe-standard-model sources that are not probed in other systems. We report on the status of such searches, in particular a new result from the Fermilab HyperCP experiment which has greatly increased the sensitivity over previous measurements and is confronting some beyond-the-standard-model theory predictions.