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Is there any evidence for a heavy neutral fermion (ν(τ)R)?

par Del Aguila, Francisco;Kane, Gordon L.;Moreno, Jésus ;Quiros, Mariano
Référence Physical review letters, 66, 23, page (2943-2946)
Publication Publié, 1991-06

Article révisé par les pairs

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Résumé :

In the standard model a right-handed neutrino can appear only by mixing with the left-handed neutrinos. Precise electroweak data constrain this mixing. We consider models in which the mixing is not proportional to neutrino masses. We have analyzed data and constraints on mt,mH with and without mixing (sinε) of neutrinos with new inert fermions. For universal v mixing, sinε=0.09; if only vτ mixes, sinετ =0.22. Thus vτ data, Γτ and ΓinvZ, if interpreted without caution, perhaps favor a nonzero vτ mixing and the existence of heavy neutral fermions.