Effects of new leptons in electroweak precision data

2008/03/31 by F. del Águila, F. del Aguila, J. de Blas +3 · 3 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.1103/physrevd.78.013010

published as Phys.Rev.D78:013010,2008 · 33 pages, 24 figures; updated with new m_t value, with minor changes. Extra references

arxiv created 2008/04/11 · openalex publication_date 2008/07/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

We obtain limits on generic vectorlike leptons at the TeV scale from electroweak precision tests. These limits are complementary to the ones obtained from lepton flavor 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\ensuremath\lesssim260 GeV at 90% C.L.), thus relaxing the tension between the direct CERN LEP limit and the standard model fit.

Citations

• Improved predictions for g−2 of the muon and αQED(MZ2)
• The s–s¯ asymmetry in the nucleon and “NuTeV anomaly”
• TASI Lectures on Extra Dimensions and Branes
• Signatures for Majorana Neutrinos at Hadron Colliders
• Matter effects andCPviolating neutrino oscillations with nondecoupling heavy neutrinos
• Particle physics implications of neutrinoless double beta decay
• NuTeV anomaly, neutrino mixing, and a heavy Higgs boson
• Experimental Precision Tests for the Electroweak Standard Model
• Neutrinoless double beta decay and direct searches for neutrino mass
• Beautiful mirrors and precision electroweak data
• Search for the Standard Model Higgs boson at LEP
• Review of Particle Physics

Cited by

• Flavor in heavy neutrino searches at the LHC
• The little review on leptogenesis
• Heavy lepton pair production at LHC: Model discrimination with multi-lepton signals