Search for CP-violation in K0 → π+π−π0 decays

We have studied the time distribution of π + π − π o decays of the neutral K meson produced in the reaction K + p → K o pπ + with K + momenta at 1.4 and 1.7 GeV/ c . Within our fiducial volume we have 98 uniquely identified π + π − π o decays with proper times between 0.04 and 20 K s lifetimes. For the ratio η +− o of the amplitude K s → π + π − π o to the amplitude K L → π + π − π o , it is found that: Re η +−0 = 0.01 ± 0.22 0.20 , Im η +−o = 0.33 ± 0.42 0.50 . This result is consistent with no CP -violation. Assuming η +− o = 0, we find the rate Г( K L → π + π − π o ) = (2.5 ± 0.3) 10 6 sec −1 .