Journal
PHYSICS LETTERS B
Volume 816, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136241
Keywords
Multi-phase criticality; Coleman-Weinberg; Effective potential; Higgs boson; Pseudo-Goldstone boson
Funding
- ERC [669668 NEO-NAT]
- European Regional Development Fund through the CoE program [TK133]
- Mobilitas Pluss grants [MOBTT5, MOBTT86]
- Estonian Research Council [PRG434, PRG803, PRG356]
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The Coleman-Weinberg mechanism can achieve dynamical symmetry breaking in different phases, where some scalars have loop-suppressed mass. Additional scalars beyond the pseudo-Goldstone bosons may become light at critical points in the parameter space. This mechanism's minimal implementation in multi-scalar models shows how loop-suppressed masses and mixings can be computed, with relevance to the Higgs boson.
The Coleman-Weinberg mechanism can realise different phases of dynamical symmetry breaking. In each phase a combination of scalars, corresponding to the pseudo-Goldstone boson of scale invariance, has a loop-suppressed mass. We show that additional scalars, beyond the pseudo-Goldstone bosons, can become light at critical points in the parameter space where two different phases co-exist. We present a minimal implementation of the mechanism in multi-scalar models, detailing how loop-suppressed masses and mixings can be computed. We discuss realisations of the resulting multi-phase criticality principle and its relevance to the case of the Higgs boson. (C) 2021 The Authors. Published by Elsevier B.V.
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