Bounds on extra quark-lepton generations from precision measurements

Details Bounds on extra quark-lepton generations from precision measurements Bounds on extra quark-lepton generations from precision measurements

2000-03-31

arxiv.org/abs/hep-ph/0003314v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, LaTeX, 4 figures included. Talk given at PASCOS99 conference, Lake Tahoe, California, December 10-16, 1999

Scientific paper

The existence of extra chiral generations is strongly disfavored by the precision electroweak data if all the extra fermions are heavier than m_Z. However fits as good as the SM can be obtained if one allows the new neutral leptons to have masses close to 50 GeV. In the framework of SUSY models precision measurements cannot exclude one additional generation of heavy fermions if chargino and neutralino have masses around 60 GeV with delta_m around 1 GeV.

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