Study ofK10→π0π0andK20→π0π0Interference

Abstract

Using $K^0\text{'}\mathrm{s}$ produced by the charge exchange of $K^{+}$, we have measured the proper-time dependence of the decays $K^0\to {\pi }^0{\pi }^0$. Analysis indicates that a third-quadrant solution for the phase of ${\eta }_{00}$ is unfavored by more than 2 standard deviations. A first-quadrant solution is acceptable.