PT Journal
AU NA62 Collaboration (Cortina Gil, Eea
   Husek, T
TI Search for production of an invisible dark photon in (0) decays
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2019
BP 182
EP 20pp
VL 05
IS 5
DI 10.1007/JHEP05(2019)182
LA English
DE Beyond Standard Model; Exotics; Fixed target experiments; Rare decay
AB The results of a search for (0) decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 x 10(8) tagged (0) mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass, improving on previous searches in the mass range 60-110 MeV/c(2). The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay 0improving the current limit by more than three orders of magnitude.
ER