Precision measurements, extra quark-lepton generations and 50 GeV neutrinos
Novikov, V.
Original · EN
The existence of extra chiral generations with all fermions heavier than mZ is strongly disfavored by the precision electroweak data. However the data still allow a few extra generations if the neutral leptons have masses close to 50 GeV. Such heavy neutrino can be searched in the reaction e+ e- → NNγ. Existence of 50 GeV neutrinos makes standard model Higgs boson invisible.
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