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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 neutrinomixes with all the Standard Model neutrinos.Comment: Revtex, 7 pages, two figures available from the authors, preprint  IFT-P.040/92 IFUSP/P-1023/9

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Constraints on singlet right-handed neutrinos coming from the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Z</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>width

Constraints on singlet right-handed neutrinos coming from theZ0width