Search for CP violation in K0 -> 3 pi0 decays

Details Search for CP violation in K0 -> 3 pi0 decays Search for CP violation in K0 -> 3 pi0 decays

2004-08-13

arxiv.org/abs/hep-ex/0408053v1

Phys.Lett.B610:165-176,2005

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 7 figures, submitted to Phys. Lett. B

Scientific paper

10.1016/j.physletb.2005.01.065

Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K_S -> 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 eta_000 = A(K_S -> 3 pi0)/A(K_L -> 3 pi0) has been found to be Re(eta_000) = -0.002 +- 0.011 +- 0.015 and Im(eta_000) = -0.003 +- 0.013 +- 0.017. This corresponds to an upper limit on the branching fraction of Br(K_S -> 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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