Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-14
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 6 figures, Proceedings ICHEP2000 Osaka conference
Scientific paper
The existence of extra chiral generations with all fermions heavier than $M_Z$ is strongly disfavored by the precision electroweak data. The exclusion of one additional generation of heavy fermions in SUSY extension of Standard Model is less forbidden if chargino and neutralino have low degenerate masses with $\Delta m \simeq 1$ GeV. However the data are fitted nicely even by a few extra generations, if one allows neutral leptons to have masses close to 50 GeV. Such heavy neutrino can be searched in the reaction $e^+ e^- \to N\bar{N}\gamma$ at LEP-200 with total final luminosity of $2600 pb^{-1}$.
Ilyin V. A.
Maltoni Michele
Novikov Vladimir A.
Okun' Lev B.
Rozanov A. N.
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