Journal
PHYSICS LETTERS B
Volume 709, Issue 3, Pages 222-228Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2012.02.013
Keywords
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Funding
- ESF [MTT8]
- Spanish Ministry MICINN [FPA2010-17747, FPA2008-01430]
- Spanish Consolider-Ingenio Programme CPAN [CSD2007-00042]
- Generalitat de Catalunya [2009SGR894]
- FPU from the Spanish Ministry of Science and Innovation
- Technische Universitat Munchen - Institute for Advanced Study
- German Excellence Initiative
- MIUR [2008XM9HLM]
- [SF0690030s09]
- ICREA Funding Source: Custom
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We update instability and metastability bounds of the Standard Model electroweak vacuum in view of the recent ATLAS and CMS Higgs results. For a Higgs mass in the range 124-126 GeV, and for the current central values of the top mass and strong coupling constant, the Higgs potential develops an instability around 10(11) GeV, with a lifetime much longer than the age of the Universe. However, taking into account theoretical and experimental errors, stability up to the Planck scale cannot be excluded. Stability at finite temperature implies an upper bound on the reheat temperature after inflation, which depends critically on the precise values of the Higgs and top masses. A Higgs mass in the range 124-126 GeV is compatible with very high values of the reheating temperature, without conflict with mechanisms of baryogenesis such as leptogenesis. We derive an upper bound on the mass of heavy right-handed neutrinos by requiring that their Yukawa couplings do not destabilize the Higgs potential. (C) 2012 Elsevier B.V. All rights reserved.
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