First results for searches of exotic decays with NA62 in beam-dump mode

Abstract

Searches for visible decays of exotic mediators can be performed by the NA62 experiment, when running in “beam-dump” mode. The analysis presented in this work, focuses on in-flight decays of dark photons to $\mu^{+}\mu^{-}$ pairs, using the data collected in 2021, corresponding to more than $10^{17}$ dumped protons