Effects of new leptons in Electroweak Precision Data

Details Effects of new leptons in Electroweak Precision Data Effects of new leptons in Electroweak Precision Data

2008-03-28

arxiv.org/abs/0803.4008v2

Phys.Rev.D78:013010,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, 24 figures; updated with new m_t value, with minor changes. Extra references

Scientific paper

10.1103/PhysRevD.78.013010

We obtain limits on generic vector-like leptons at the TeV scale from electroweak precision tests. These limits are complementary to the ones obtained from lepton flavour violating processes. In general, the quality of the global electroweak fit is comparable to the one for the Standard Model. In the case of an extra neutrino singlet mixing with the muon or electron, the global fit allows for a relatively large Higgs mass (M_H < 260 GeV at 90 % C.L.), thus relaxing the tension between the direct LEP limit and the Standard Model fit.

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