Extra quark-lepton generations and precision measurements
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 ad...
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| Veröffentlicht in: | Physics letters. B 2000-03, Vol.476 (1), p.107-115 |
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| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | 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
Δm≃1 GeV. |
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| ISSN: | 0370-2693 1873-2445 |
| DOI: | 10.1016/S0370-2693(00)00109-X |