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Higgs effective potential in the littlest Higgs model at the one-loop level

AuthorsDobado, Antonio; Tabares-Cheluci, Lourdes; Peñaranda, Siannah
KeywordsHiggs model
SO groups
Standard model
SU(2) theory
SU(5) theory
Unitary symmetry
Issue Date30-Apr-2007
PublisherAmerican Physical Society
CitationPhysical Review D 75(8): 083527 (2007)
AbstractIn this work we compute the contributions to the Higgs effective potential coming from the fermion and gauge boson sectors at the one-loop level in the context of the SU(5)/SO(5) littlest Higgs (LH) model using a cutoff Lambda and including all finite parts. We consider both, the (SU(2) x U(1))(1) x (SU(2) x U(1))(2) and the (SU(2) x U(1))(1) x (SU(2) x U(1)) gauge group versions of the LH model. We also show that the Goldstone bosons present in the model do not contribute to the effective potential at the one-loop level. Finally, by neglecting the contribution of higher dimensional operators, we discuss the restrictions that the new one-loop contributions set on the parameter space of the LH model and the need to include higher loop corrections to the Higgs potential.
Description12 pages, 6 figures.-- PACS nrs.: 95.35.+d; 11.10.Kk; 11.25.-w.-- ISI Article Identifier: 000246076900042.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0612131
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.75.083527
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