Search for CP violation in K0 -> 3 pi0 decays
NA48 Collaboration
Abstract
Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay KS -> 3 pi0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K0/K0bar -> 3 pi0 decays, the CP violating amplitude eta000 = A(KS -> 3 pi0)/A(KL -> 3 pi0) has been found to be Re(eta000) = -0.002 +- 0.011 +- 0.015 and Im(eta000) = -0.003 +- 0.013 +- 0.017. This corresponds to an upper limit on the branching fraction of Br(KS -> 3 pi0) < 7.4 x 10-7 at 90% confidence level. The result is used to improve knowledge of Re(epsilon) and the CPT violating quantity Im(delta) via the Bell-Steinberger relation.
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