Dobado González, AntonioTabares Cheluci, LourdesPeñaranda , Siannah2023-06-202023-06-202007-041550-799810.1103/PhysRevA.75.083527https://hdl.handle.net/20.500.14352/50715© 2007 The American Physical Society. This work is supported by DGICYT (Spain) under Project No. BPA2005-02327. The work of S. P. is supported by the I3P-Contract of CSIC at IFIC—Instituto de Física Corpuscular, Valencia. The work of L. TabaresCheluci is supported by a FPU grant from the Spanish M.E.C.In 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.engjournal articlehttp://prd.aps.org/abstract/PRD/v75/i8/e083527http://prd.aps.orgopen access53Chiral Perturbation-TheorySupersymmetrySymmetryFísica (Física)22 Física