Kavli Affiliate: Gordan Krnjaic
| First 5 Authors: Gordan Krnjaic, Duncan Rocha, Isaac R. Wang, ,
| Summary:
The MUonE experiment aims to extract the hadronic contribution to the muon
anomalous magnetic moment from a precise measurement of the muon-electron
differential scattering cross section. We show that MUonE can also discover
thermal relic dark matter using only its nominal experimental setup. Our search
strategy is sensitive to models of dark matter in which pairs of pseudo-Dirac
fermions are produced in muon-nucleus scattering in the target, and the heavier
state decays semi-visibly to yield dilepton pairs displaced downstream from the
interaction point. This approach can probe sub-GeV thermal-relic dark matter
whose cosmological abundance is governed by the same model parameters that set
the MUonE signal strength. Furthermore, our results show that the downstream
ECAL plays a key role in rejecting backgrounds for this search, thereby
providing strong motivation for the MUonE to keep this component in the final
experimental design.
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