New physics effects in rare Z decays

Abstract

Virtual effects induced by new physics in rare Z decays are reviewed. Since the expected sensitivity of the giga-Z linear collider is of the order of $10^{-8}$, we emphasize the importance of any new physics effect that gives a prediction above this limit. It is also pointed out that an improvement on the known experimental constraints on rare Z decays will provide us with a critical test of the validity of the standard model at the loop level.

arXiv comment16 pages, 4 figures, submitted to Int. J. Mod. Phys. A

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• Search for the electromagnetic properties of the neutrinos at the HL-LHC and the FCC-hh
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• Decay of the Z' gauge boson with lepton flavor violation
• Search for new physics effects in $\nu \bar{\nu }\gamma$ production at a Tera-Z factory
• Z'-> ggg decay in left-right symmetric models with three and four fermion families
• Neutrino mixings as a source of lepton flavor violations