Journal
PHYSICS LETTERS B
Volume 476, Issue 1-2, Pages 107-115Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(00)00109-X
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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 similar or equal to 1 GeV. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
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