A sample of 4.687 × 106 fully reconstructed K+ → π+π0 D, π0 D → γe+e- decay candidates in the kinematic range mee > 10 MeV/c2 with a negligible background contamination collected by the NA48/2 experiment at CERN in 2003-04 is analysed to search for the dark photon (A') via the decay chain K+ → π+π0, π0 → γA', A' → e+e-. No signal is observed, and preliminary exclusion limits on space of dark photon mass m'A and mixing parameter ϵ2 are reported.
|Original language||English (US)|
|Journal||EPJ Web of Conferences|
|State||Published - 2015|
|Event||International Conference Dark Matter, Hadron Physics and Fusion Physics, DHF 2014 - Messina, Italy|
Duration: Sep 24 2014 → Sep 26 2014
ASJC Scopus subject areas
- Physics and Astronomy(all)