Little Higgs Models and Electroweak Measurements

Details Little Higgs Models and Electroweak Measurements Little Higgs Models and Electroweak Measurements

2005-06-21

arxiv.org/abs/hep-ph/0506206v3

Phys.Rev. D72 (2005) 035005

Physics

High Energy Physics

High Energy Physics - Phenomenology

Small changes to the plots due to the change in numerical results in hep-ph/0412166, text unchanged

Scientific paper

10.1103/PhysRevD.72.035005

Using effective field theory approach, we study the constraints from electroweak data on the SU(5)/SO(5), SU(6)/SP(6), SU(3)xU(1) little Higgs models and their variations. We construct an effective theory valid above the electroweak symmetry breaking scale in these models that includes dimension-six operators induced by integrating out heavy fields. We calculate the constraints on the models using the results of hep-ph/0412166, where bounds on arbitrary linear combinations of flavor and CP conserving dimension-six operators are given. We present the constraints in terms of the bounds on the masses of heavy fermions and heavy gauge bosons. The constraints are often stringent, but in some regions of the parameter space the constraints are mild enough and do not imply significant fine-tuning.

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