Extra quark-lepton generations and precision measurements
M.Maltoni, V.A.Novikov, L.B.Okun, A.N.Rozanov, M.I.Vysotsky
TL;DR
The paper examines how additional quark-lepton generations affect precision measurements, finding that extra generations are compatible with data if certain particles have specific masses near the Z boson mass.
Contribution
It explores the conditions under which extra fermion generations can be consistent with electroweak precision data, especially in supersymmetric extensions of the Standard Model.
Findings
Extra generations are disfavoured unless neutral leptons are near 50 GeV.
One additional heavy fermion generation can be included if charginos and neutralinos are around 60 GeV.
Precision data can accommodate extra generations with specific mass configurations.
Abstract
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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