Azevedo, DuarteFerreira, Pedro MiguelLogan, Heather E.Santos, Rui2021-08-302021-08-302021-03-23AZEVEDO, Duarte; [et al] – Vacuum structure of the Z(2) symmetric Georgi-Machacek model. Journal of High Energy Physics. ISSN 1029-8479. Vol. 2021, N.º 3 (2021), pp. 1-241029-8479http://hdl.handle.net/10400.21/13662We discuss the vacuum structure of a version of the Georgi-Machecek model with an exact Z(2) symmetry acting on the triplet fields. Besides the usual custodial-symmetric model, with rho = 1 at tree-level, a model with a dark matter candidate is also viable. The other phases of the model lead to electric charge breaking, a wrong pattern of electroweak symmetry breaking or to rho not equal 1 at tree-level. We derive conditions to have an absolute minimum in each of the two viable phases, the custodial and the dark matter phases.engBeyond Standard ModelHiggs Physicsjournal article10.1007/JHEP03(2021)221