We measured the amplitude for the CP-symmetry-conserving decay K0S → π+ π- π0 in an experiment at Fermilab. This decay manifests itself as a time dependent charge asymmetry in the interference between the coherent KS and KL decays. We collected 1.1 million π+ π- π0 decays between 0.6 and 7.6 KS lifetimes from the production target using a detector that consisted of a magnetic spectrometer and a lead glass electromagnetic calorimeter. The ratio ρ+-0 of the CP-conserving KS amplitude to the KL amplitude is found to be: | p+-0 |= 0.039+0.009-0.006 (stat.) ±0.005 (syst.), with a phase φp = -9° ± 18°. This yields a branching ratio of (4.81+2.2-1.6 (stat.) ±1.1(syst.)) × 10-7.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Feb 29 1996|