Constraints on singlet right-handed neutrinos coming from the $Z^0$-width

Abstract

We study the constraints on masses and mixing angles imposed by the measured $Z^0$ invisible width, in a model in which a singlet right-handed neutrino mixes with all the Standard Model neutrinos.

Revtex, 7 pages, two figures available from the authors, preprint IFT-P.040/92 IFUSP/P-1023/92

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• Constraints on spin-3/2 and excited spin-1/2 fermions coming from the leptonic Z0-partial width
• Limits on Majorana Neutrinos from Recent Experimental Data
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