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Nonperturbative evidence for nondecoupling of heavy fermions
Aoki, Kenichiro (University of California at Los Angeles. Department of Physics)
Peris, S. (Santiago) (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Data: 1993
Resum: We investigate, using a 1/N expansion, the behavior of a parameter in the scalar-fermion sector of the standard model that shows perturbative nondecoupling as the fermion becomes heavy. This low-energy parameter is related to the S parameter defined through W3-B mixing. We obtain the leading 1/N contribution to this parameter that, if expanded perturbatively, collapses to its constant one-loop result. Nonperturbatively, we find that as the mass of the fermion approaches the triviality scale the behavior of the parameter is nonuniversal and shows nondecoupling.
Drets: Tots els drets reservats.
Llengua: Anglès
Document: article ; publishedVersion
Publicat a: Physical review letters, Vol. 70, Issue 12 (March 1993) , p. 1743-1746, ISSN 0031-9007

DOI: 10.1103/PhysRevLett.70.1743

4 p, 198.9 KB

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