One-loop Radiative Corrections to the rho Parameter in the Littlest Higgs Model
Abstract
We perform a one-loop analysis of the rho parameter in the Littlest Higgs model, including the logarithmically enhanced contributions from both fermion and scalar loops. We find the one-loop contributions are comparable to the tree level corrections in some regions of parameter space. The fermion loop contribution dominates in the low cutoff scale f region. On the other hand, the scalar loop contribution dominates in the high cutoff scale f region and it grows with the cutoff scale f. This in turn implies an upper bound on the cutoff scale. A low cutoff scale is allowed for a non-zero triplet VEV. Constraints on various other parameters in the model are also discussed. The role of triplet scalars in constructing a consistent renormalization scheme is emphasized.
Cite
@article{arxiv.hep-ph/0311032,
title = {One-loop Radiative Corrections to the rho Parameter in the Littlest Higgs Model},
author = {Mu-Chun Chen and Sally Dawson},
journal= {arXiv preprint arXiv:hep-ph/0311032},
year = {2008}
}
Comments
ReVTeX4; 39 pages; 12 figures; v2: renormalization scheme clarified; v3: version to appear in Phys. Rev. D