TY - JOUR
T1 - Extra families, Higgs spectrum, and oblique corrections
AU - He, Hong Jian
AU - Polonsky, Nir
AU - Su, Shufang
PY - 2001/9/1
Y1 - 2001/9/1
N2 - The standard model accommodates, but does not explain, three families of leptons and quarks, while various extensions suggest extra matter families. The oblique corrections from extra chiral families with relatively light (weak-scale) masses, Mf∼〈H〉, are analyzed and used to constrain the number of extra families and their spectrum. The analysis is motivated, in part, by recent N=2 supersymmetry constructions, but is performed in a model-independent way. It is shown that the correlations among the contributions to the three oblique parameters, rather than the contribution to a particular one, provide the most significant bound. Nevertheless, a single extra chiral family with a constrained spectrum is found to be consistent with precision data without requiring any other new physics source. Models with three additional families may also be accommodated but only by invoking additional new physics, most notably, a two-Higgs-doublet extension. The interplay between the spectra of the extra fermions and the Higgs boson(s) is analyzed in the case of either one or two Higgs doublets, and its implications are explored. In particular, the precision bound on the standard model-like Higgs boson mass is shown to be significantly relaxed in the presence of an extra relatively light chiral family.
AB - The standard model accommodates, but does not explain, three families of leptons and quarks, while various extensions suggest extra matter families. The oblique corrections from extra chiral families with relatively light (weak-scale) masses, Mf∼〈H〉, are analyzed and used to constrain the number of extra families and their spectrum. The analysis is motivated, in part, by recent N=2 supersymmetry constructions, but is performed in a model-independent way. It is shown that the correlations among the contributions to the three oblique parameters, rather than the contribution to a particular one, provide the most significant bound. Nevertheless, a single extra chiral family with a constrained spectrum is found to be consistent with precision data without requiring any other new physics source. Models with three additional families may also be accommodated but only by invoking additional new physics, most notably, a two-Higgs-doublet extension. The interplay between the spectra of the extra fermions and the Higgs boson(s) is analyzed in the case of either one or two Higgs doublets, and its implications are explored. In particular, the precision bound on the standard model-like Higgs boson mass is shown to be significantly relaxed in the presence of an extra relatively light chiral family.
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M3 - Article
AN - SCOPUS:84867057314
VL - 64
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 0556-2821
IS - 5
M1 - 053004
ER -