Proposal for an experiment to search for dark sector particles weakly coupled to muon at the SPS (original) (raw)
The NA64 collaboration proposes to carry out further searches for dark sector and other rare processes in missing energy events from high energy muon interactions in a hermetic detector at the CERN SPS for the 2021 pilot run. A dark sector of particles predominantly weakly-coupled to the second and possibly third generations of the Standard Model is motivated by several theoretically interesting models. Additional to gravity this new very weak interaction between the visible and dark sector could be mediated either by a scalar (Sμ) or U ′(1) gauge bosons (Zμ) interacting with ordinary muons. In a class of Lμ − Lτ models the corresponding Zμ could be light and have the coupling strength lying in the experimentally accessible region. If such Zμ mediator exists it could also explain the muon (g − 2)μ anomaly the discrepancy between the predicted and measured values of the muon anomalous magnetic moment. We propose an extension of the experiment called NA64μ to search for invisible deca...
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