Electroweak model and constraints on new physics

It is shown that additional chiral generations are not excluded by the latest electroweak precision data if one assumes that there is no mixing with the known three generations. In the case of ``heavy extra generations'', when all four new particles are heavier than $Z$ boson, quality of the fit for the one new generation is as good as for zero new generations (Standard Model). In the case of neutral leptons with masses around 50 GeV (``partially heavy extra generations'') the minimum of $\chi^2$ is between one and two extra generations.Comment: 10 pages, TeX. An additional reference and P.P.S. about heavy higgs are adde

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Positron polarization in the decay of polarized 12N: a precision test of the Standard Model

Thomas

Prieels

Allet

et al. 2001

Nuclear Physics A

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Electroweak model and constraints on new physics

Cited by 14 publications

References 127 publications

Search for t→ch at e+e− linear colliders

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Extra generations and discrepancies of electroweak precision data

Positron polarization in the decay of polarized 12N: a precision test of the Standard Model

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