Kavli Affiliate: Gordan Krnjaic
| First 5 Authors: Gordan Krnjaic, Duncan Rocha, Isaac R. Wang, ,
| Summary:
The MUonE experiment aims to extract the hardonic contribution 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 the 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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