Phys. Rev. D 62, 035002 (2000) [18 pages]Weak-singlet fermions: Models and constraintsReceived 9 February 2000; published 19 June 2000 We employ data from precision electroweak tests and collider searches to derive constraints on the possibility that weak-singlet fermions mix with the ordinary standard model fermions. Our findings are presented within the context of a theory with weak-singlet partners for all ordinary fermions and theories in which only third-generation fermions mix with weak singlets. In addition, we indicate how our results can be applied more widely in theories containing exotic fermions. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.62.035002
DOI:
10.1103/PhysRevD.62.035002
PACS:
12.60.-i, 12.15.Ff, 13.85.Rm, 14.80.-j
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