Search for the dark photon in π0 decays by the NA48/2 experiment at CERN

A sample of 4.687 x 10(6) fully reconstructed K-+/- -> pi(+/-)pi(0)(D), pi(0)(D) -> gamma e(+)e(-) decay candidates in the kinematic range m(ee) > 10 MeV/c(2) with a negligible background contamination collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon (Lambda') via the decay chain K-+/- -> pi(+/-)pi(0), pi(0) -> gamma Lambda', A' -> e(+)e(-). No signal is observed, and preliminary exclusion limits on space of dark photon mass m(A)' and mixing parameter epsilon(2) are reported.