Rare Z Decays and Neutrino Flavor Universality
arXiv:1512.03071 · doi:10.1103/PhysRevD.93.093005
Abstract
We study rare four-body decays of the Z-boson involving at least one neutrino and one charged lepton. Large destructive interferences make these decays very sensitive to the Z couplings to neutrinos. As the identified charged leptons can determine the neutrino flavors, these decays probe the universality of the Z couplings to neutrinos. The rare four-body processes could be accurately measured at future lepton colliders, leading to percent level precision.
8 pages, 6 figures; v2: minor updates, matches published version
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