2002/05/29 by V. A. Novikov, V.A. Novikov, Novikov, V. A.
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Cosmology and Gravitation Theories #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0205320
12 paghes, 6 figures, Talk at Les Rencontres de Physique de la Valle d'Aoste 2002
arxiv created 2002/05/29 · openalex publication_date 2002/05/29 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The latest electroweak precision data are analyzed assuming the existence of the fourth generation of leptons (N, E) and quarks (U, D), which are not mixed with the known three generations. If all four new particles are heavier than Z boson, quality of the fit for the one new generation is as good as for the Standard Model. In the case of neutral leptons with masses around 50 GeV (``partially heavy extra generations'') the minimum of χ2 is between one and two extra generations. The predicted value of the higgs mass mH in the presence of the fourth generation can be made rather large. The quality of fits drastically improves when the data on b- and c-quark asymmetries and new NuTeV data on deep inelastic scattering are ignored.