University of Pennsylvania
Department of Physics and Astronomy
High Energy Physics Seminar

In the almost 40 years since the discovery of CP violation in kaon decays, the origin of CP violation has remained elusive. In addition, the relationship of CP violation to time reversal violation has been indirect, depending on use of the CPT theorem. The KTeV experiment with much enhanced sensitivity has continued the measurement of epsilon prime begun by earlier experiments. In addition, because of its increased sensitivity, it has been able to look for time reversal violation in new, previously undetected modes such as K0L->pi+pi-e+e-. We report on the status of the epsilon prime measurement and on observation of a new CP violation effect, one which is explictly time reversal violating.