A sample of 4.687 × 106 fully reconstructed K+ → π+π0D, π0D → 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.
Search for the dark photon in π0 decays by the NA48/2 experiment at CERN
COLLAZUOL, GIANMARIA;COSTANTINI, FLAVIO;GIUDICI, SERGIO;LAMANNA, GIANLUCA;PIERAZZINI, GIUSEPPE;RUGGIERO, GIUSEPPE;SOZZI, MARCO STANISLAO;VENDITTI, STEFANO;
2015-01-01
Abstract
A sample of 4.687 × 106 fully reconstructed K+ → π+π0D, π0D → 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.File in questo prodotto:
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