Erika De Lucia (Laboratori Nazionali di Frascati (LNF)-Istituto Nazionale Fisic)
The Ks --> 3pi0 decay is a pure CP violating process which, assuming CPT invariance, allows direct CP violation to be investigated. This decay has not been observed so far, and the best upper limit on the branching ratio BR(KS --> 3pi0)< 1.2 10-7 is two orders of magnitude larger than predictions based on the Standard Model. We present the search for the Ks --> 3pi0 decay performed with the KLOE detector at the DAFNE Phi-factory of the INFN Frascati Laboratory improving the present upper limit by a factor about 5. We describe the experimental techniques used in the background rejection and signal events selection. We also discuss briefly the perspectives for a new measurement using the KLOE-2 apparatus equipped with a new Inner Tracker and calorimeters at low theta angle.
Fabio Bossi (Laboratori Nazionali di Frascati (LNF))