Abstract
A search for sub-GeV dark matter production mediated by a new vector boson A^{'}, called a dark photon, is performed by the NA64 experiment in missing energy events from 100GeV electron interactions in an active beam dump at the CERN SPS. From the analysis of the data collected in the years 2016, 2017, and 2018 with 2.84×10^{11} electrons on target no evidence of such a process has been found. The most stringent constraints on the A^{'} mixing strength with photons and the parameter space for the scalar and fermionic dark matter in the mass range ≲0.2 GeV are derived, thus demonstrating the power of the active beam dump approach for the dark matter search.
Highlights
A search for sub-GeV dark matter production mediated by a new vector boson A0, called a dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS
The idea that in addition to gravity a new force between the dark and visible matter transmitted by a vector boson, A0, called dark photon, might exist is quite exciting [1,2,3,4]
In this work we report new results on the search for the A0 mediator and light dark matter (LDM) in the fixed-target experiment NA64 at the CERN SPS
Summary
A search for sub-GeV dark matter production mediated by a new vector boson A0, called a dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS. A Geant4 [50,51] based Monte Carlo (MC) simulation used to study the detector performance, signal acceptance, and background level, as well as the analysis procedure including selection of cuts and estimate of the sensitivity are described in detail in Ref.
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