Neutral pion form factor measurement by the NA62 experiment

The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from about one million fully reconstructed π 0 Dalitz decays is presented.The limits on dark photon production from a sample of about 1.7 × 10 7 π 0 Dalitz decays collected in 2003-2004 by the earlier kaon experiment at CERN NA48/2 are also reported.