Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-02-25
Phys.Lett.B401:74-80,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 2 embedded figures, LaTeX; references and discussion of CP violation added
Scientific paper
10.1016/S0370-2693(97)00387-0
The triviality of the scalar sector of the standard one-doublet Higgs model implies that this model is only an effective low-energy theory valid below some cut-off scale $\Lambda$. The underlying high-energy theory must include flavor dynamics at a scale of order $\Lambda$ or greater in order to give rise to the different Yukawa couplings of the Higgs to ordinary fermions. This flavor dynamics will generically produce flavor-changing neutral currents and non-universal corrections to Z -> b b-bar. We show that the experimental constraints on the neutral D-meson mass difference imply that $\Lambda$ must be greater than of order 21 TeV. We also discuss bounds on $\Lambda$ from the constraints on extra contributions to the K_L - K_S mass difference and to the coupling of the Z boson to b-quarks. For theories defined about the infrared-stable Gaussian fixed-point, we estimate that this lower bound on $\Lambda$ yields an upper bound of approximately 460 GeV on the Higgs boson's mass, independent of the regulator chosen to define the theory.
Chivukula Sekhar R.
Dobrescu Bogdan A.
Simmons Elizabeth H.
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