Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-11-08
Phys.Rev.D67:115002,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 5 figures included, typos fixed, comments on the effects of extra vector-like heavy fermions added
Scientific paper
10.1103/PhysRevD.67.115002
We calculate the tree-level expressions for the electroweak precision observables in the SU(5)/SO(5) littlest Higgs model. The source for these corrections are the exchange of heavy gauge bosons, explicit corrections due to non-linear sigma-model dynamics and a triplet Higgs VEV. Weak isospin violating contributions are present because there is no custodial SU(2) global symmetry. The bulk of these weak isospin violating corrections arise from heavy gauge boson exchange while a smaller contribution comes from the triplet Higgs VEV. A global fit is performed to the experimental data and we find that throughout the parameter space the symmetry breaking scale is bounded by f > 4 TeV at 95% C.L. Stronger bounds on f are found for generic choices of the high energy gauge couplings. We find that even in the best case scenario one would need fine tuning of less than a percent to get a Higgs mass as light as 200 GeV.
Csa'ki Csaba
Hubisz Jay
Kribs Graham D.
Meade Patrick
Terning John
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