TY - JOUR

T1 - Big corrections from a little Higgs

AU - Csáki, Csaba

AU - Hubisz, Jay

AU - Kribs, Graham D.

AU - Meade, Patrick

AU - Terning, John

PY - 2003

Y1 - 2003

N2 - We calculate the tree-level expressions for the electroweak precision observables in the [Formula Presented] littlest Higgs model. The source for these corrections are the exchange of heavy gauge bosons and a triplet Higgs vacuum expectation value (VEV). Weak isospin violating contributions are present because there is no custodial [Formula Presented] 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 [Formula Presented] 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 boson mass as light as 200 GeV.

AB - We calculate the tree-level expressions for the electroweak precision observables in the [Formula Presented] littlest Higgs model. The source for these corrections are the exchange of heavy gauge bosons and a triplet Higgs vacuum expectation value (VEV). Weak isospin violating contributions are present because there is no custodial [Formula Presented] 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 [Formula Presented] 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 boson mass as light as 200 GeV.

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U2 - 10.1103/PhysRevD.67.115002

DO - 10.1103/PhysRevD.67.115002

M3 - Article

AN - SCOPUS:0037998905

SN - 1550-7998

VL - 67

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 11

ER -