Extra quark-lepton generations and precision measurements

Details Extra quark-lepton generations and precision measurements Extra quark-lepton generations and precision measurements

1999-11-30

arxiv.org/abs/hep-ph/9911535v1

Phys.Lett.B476:107-115,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures

Scientific paper

10.1016/S0370-2693(00)00109-X

The existence of extra chiral generations with all fermions heavier than M_Z is strongly disfavoured by the precision electroweak data. However the data are fitted nicely even by a few extra generations, if one allows neutral leptons to have masses close to 50 GeV. The data allow inclusion of one additional generation of heavy fermions in SUSY extension of Standard Model if chargino and neutralino have masses close to 60 GeV with \Delta m =~ 1 GeV.

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