22. March 2023

Recent results of NA64 for Dark Matter searches at CERN Recent results of NA64 for Dark Matter searches at CERN

Group report at DPG SMuK 2023

Author: Michael Hösgen for the NA64 collaboration

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We report on the recent activity of the NA64 experiment at the SPS of CERN. The NA64 experiment uses an active beam-dump setup to conduct missing energy searches with high-intensity lepton beams (e or mu).

Since 2016 several dedicated searches for new mediators between standard model and dark sector were performed, most notably a light vector boson A’ and a short-lived neutral boson X(17). The A’ was proposed as a possible explanation for magnetic-moment anomalies of muons. At NA64 it could be created in electron-on-target reactions eZ→eZA′ and supposedly decay invisibly into lighter dark-sector particles (A′→χχbar). The X is motivated by an excess of e+e-pairs in 8Be* excited state nuclear transitions. At NA64 it could be produced in bremsstrahlung interactions eZ→eZX and decay into standard model leptons (X→e+e).

Starting in 2021, the search for a dark portal was expanded with a dedicated setup using a muon beam at the M2 beamline at the SPS of CERN. In 2022, a pilot run using an e+ beam for resonant A’ production in our active target was performed.

We present an overview over the experimental setups and analysis strategies, as well as the updated results until 2022.

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