Physical Sciences and Mathematics Commons^™

Weak-Singlet Fermions: Models And Constraints, Marko Popovic, Elizabeth Simmons

Marko B. Popovic

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.