Precision measurements, extra quark-lepton generations and 50 GeV neutrinos

Details Precision measurements, extra quark-lepton generations and 50 GeV neutrinos Precision measurements, extra quark-lepton generations and 50 GeV neutrinos

2001-06-24

arxiv.org/abs/hep-ph/0106261v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 4 figures. Talk at Les Rencontres de Physique de la Vallee d'Aoste, 2001

Scientific paper

The existence of extra chiral generations with all fermions heavier than $m_Z$ 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 $e^+ e^- \to N\bar{N}\gamma$. Existence of 50 GeV neutrinos makes standard model Higgs boson invisible.

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