Precision measurements, extra generations and heavy neutrino

6533b851fe1ef96bd12a8f55

RESEARCH PRODUCT

Precision measurements, extra generations and heavy neutrino

V. A. Ilyin Michele Maltoni V. A. Novikov L. B. Okun Alexandre N. Rozanov M. I. Vysotsky

subject

High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph)[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]Astrophysics::High Energy Astrophysical Phenomena High Energy Physics::Phenomenology [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]FOS: Physical sciences High Energy Physics::Experiment Nuclear Experiment

description

The existence of extra chiral generations with all fermions heavier than $M_Z$ is strongly disfavored by the precision electroweak data. The exclusion of one additional generation of heavy fermions in SUSY extension of Standard Model is less forbidden if chargino and neutralino have low degenerate masses with $\Delta m \simeq 1$ GeV. However the data are fitted nicely even by a few extra generations, if one allows neutral leptons to have masses close to 50 GeV. Such heavy neutrino can be searched in the reaction $e^+ e^- \to N\bar{N}\gamma$ at LEP-200 with total final luminosity of $2600 pb^{-1}$.

year	journal	country	edition	language
2000-07-27

http://hal.in2p3.fr/in2p3-00010896

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