https://doi.org/10.1140/epjc/s10052-023-11407-z
Regular Article - Theoretical Physics
Vacuum stability and radiative symmetry breaking of the scale-invariant singlet extension of type II seesaw model
1
School of Physics and Center of Excellence in High Energy Physics and Astrophysics, Suranaree University of Technology, 30000, Nakhon Ratchasima, Thailand
2
Laboratory of High Energy and Computational Physics, NICPB, Rävala, 10143, Tallinn, Estonia
Received:
11
January
2023
Accepted:
15
March
2023
Published online:
25
March
2023
The questions of the origin of electroweak symmetry breaking and neutrino mass are two major puzzles in particle physics. Neutrino mass generation requires new physics beyond the Standard Model and also suggests reconsideration of physics of symmetry breaking. The aim of this paper is to study radiative symmetry breaking in the singlet scalar extension of type II seesaw neutrino mass model. We derive bounded-from-below conditions for the scalar potential of the model in full generality for the first time. The Gildener–Weinberg approach is utilised in minimising the multiscalar potential. Upon imposing the bounded-from-below and perturbativity conditions, as well as experimental constraints from colliders, we find the parameter space of scalar quartic couplings that can radiatively realise electroweak symmetry breaking at one-loop level. To satisfy all the constraints, the masses of the heavy triplet-like Higgs bosons must be nearly degenerate. The evolution of the Higgs doublet quartic coupling 
can be prevented from being negative up to the Planck scale.
© The Author(s) 2023
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