Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS

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ID: 274200
2017
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Abstract
We report on a direct search for sub-GeV dark photons (${A}^{\ensuremath{'}}$), which might be produced in the reaction ${e}^{\ensuremath{-}}Z\ensuremath{\rightarrow}{e}^{\ensuremath{-}}Z{A}^{\ensuremath{'}}$ via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The dark photons would decay invisibly into dark matter particles resulting in events with large missing energy. No evidence for such decays was found with $2.75\ifmmode\times\else\texttimes\fi{}1{0}^{9}$ electrons on target. We set new limits on the $\ensuremath{\gamma}\ensuremath{-}{A}^{\ensuremath{'}}$ mixing strength and exclude the invisible ${A}^{\ensuremath{'}}$ with a mass $\ensuremath{\lesssim}100\text{ }\text{ }\mathrm{MeV}$ as an explanation of the muon ${g}_{\ensuremath{\mu}}\ensuremath{-}2$ anomaly.
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2017physicalsearch Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
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Journal physical review letters
Year 2017
DOI
doi:10.1103/PhysRevLett.118.011802
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