Current constraints on μ-τ SMEFT four-lepton operators exclude heavy-mediator UV completions of strong neutrino self-interactions in the dimension-six SMEFT without tuned cancellations, while leaving light-mediator scenarios open.
First results in the search for dark sectors at NA64 with the CERN SPS high energy muon beam.Physical Review Letters, 132(21):211803
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Theoretical and Experimental Constraints in the $\mu$--$\tau$ Four-Lepton Sector of the SMEFT: implications to neutrino self interactions
Current constraints on μ-τ SMEFT four-lepton operators exclude heavy-mediator UV completions of strong neutrino self-interactions in the dimension-six SMEFT without tuned cancellations, while leaving light-mediator scenarios open.