Electroweak symmetry breaking by vectorlike fermion condensation with small {ital S} and {ital T} parameters

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.52.1684· OSTI ID:76540

Maekawa, N ^[1]

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1. Department of Physics, Tohoku University, Sendai 980 (Japan)

In order to build realistic models in which electroweak symmetry is dynamically broken we should explain the smallness of the Peskin-Takeuchi {ital S} and {ital T} parameters. In accordance with the decoupling theorem, these parameters must be suppressed by SU(2){sub {ital L}}{times}U(1){sub {ital Y}} invariant masses. From this fact we can expect that if fermions with large SU(2){sub {ital L}}{times}U(1){sub {ital Y}} invariant masses undergo condensation and break electroweak symmetry, the {ital S} and {ital T} parameters can be small. It is intersting that not only the {ital S} but also the {ital T} parameter can become small even if there exists a large isospin violation in fermion condensation. In this paper we examine the possibility that, by the strong four-Fermi interaction, massive vectorlike fields undergo condensation and break electroweak symmetry. The model becomes almost the same as the standard model at a low energy scale and predicts a heavy Higgs boson. Moreover, we discuss a model in which the four-Fermi interaction can be induced by massive gauge boson exchange. In this model, the masses of ordinary matter fermions (quark and lepton) are enhanced.

• OSTI ID: 76540
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 52; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CONDENSATES
ELECTROMAGNETIC INTERACTIONS
FERMIONS
HIGGS BOSONS
ISOSPIN
MASS
SU-2 GROUPS
SYMMETRY BREAKING
U-1 GROUPS
WEAK INTERACTIONS