TY - JOUR
T1 - Nonperturbative evidence for nondecoupling of heavy fermions
AU - Aoki, Kenichiro
AU - Peris, Santiago
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.70.1743
DO - 10.1103/PhysRevLett.70.1743
M3 - Article
AN - SCOPUS:0346223351
VL - 70
SP - 1743
EP - 1746
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 12
ER -