Custodial Symmetry and the Triviality Bound on the Higgs Mass

Details Custodial Symmetry and the Triviality Bound on the Higgs Mass Custodial Symmetry and the Triviality Bound on the Higgs Mass

1996-08-14

arxiv.org/abs/hep-ph/9608320v2

Phys.Lett. B388 (1996) 788-792

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 references added; 8 pages, 3 embedded Postscript figures, LaTeX, full postscript version also available at http://smyrd.bu

Scientific paper

10.1016/S0370-2693(96)01212-9

The triviality of the scalar sector of the standard one-doublet Higgs model implies that it is only an effective low-energy theory valid below some cut-off scale $\Lambda$. In this note we show that the experimental constraint on the amount of custodial symmetry violation, $|\Delta \rho_* | = \alpha |T | \le 0.4\%$, implies that the scale $\Lambda$ must be greater than of order 7.5 TeV. For theories defined about the infrared-stable Gaussian fixed-point, we estimate that this lower bound on $\Lambda$ yields an upper bound of approximately 550 GeV on the Higgs boson's mass, independent of the regulator chosen to define the theory. We also show that some regulator schemes, such as higher-derivative regulators, used to define the theory about a different fixed-point are particularly dangerous because an infinite number of custodial-isospin-violating operators become relevant.

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