Workbook

108
our data sample, which yields a measurement accuracy of 1 0 for acp. We are
finishing our analysis after presenting preliminary results during the spring
and summer of 1994.
We expect to publish measurements of the phase difference between 1100
and 11+-, the phase of 11+-, and the magnitude and phase of 11+-y, where 11+-y is
the ratio of the amplitudes for KL and Ks to decay to 1t1tr. Shown in the
accompanying figure are acceptance-corrected decay distributions for 1t+1tand
1t 0 1t 0 decays from the upstream-regenerator beam in a restricted energy
range. The interference between the KL and Ks decay amplitudes is clearly
visible.