Precision measurement of the direct CP violation parameter {var_epsilon}{prime}/{var_epsilon} via the four K {yields} 2{pi} decay modes and a high sensitivity search for CP violating rare K{sub L} decays, Task J. Progress report, May 1, 1991--April 30, 1992

This report discusses the progress on the measurement of the direct CP violation parameter {var_epsilon}{prime}/{var_epsilon} and the rare KL decay. The progress has been as follows: (A) results from the complete E731 data set which was collected in the 1987/88 fixed target run; preparations for and the taking of the data for (B) E773 (CPT symmetry test) and (C) E799 (rare decay study); and finally (D) R&D for a new detector to further study {var_epsilon}{prime}/{var_epsilon} and rate decays.