Electroweak symmetry breaking by vectorlike fermion condensation with small {ital S} and {ital T} parameters
- 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, Vol. 52, Issue 3; Other Information: PBD: 1 Aug 1995
- Country of Publication:
- United States
- Language:
- English
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