Higgs mass implications on the stability of the electroweak vacuum |
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Authors: | Joan Elias-Miró José R Espinosa Gian F Giudice Gino Isidori Antonio Riotto Alessandro Strumia |
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Institution: | 1. IFAE and Dep. de Física, Univ. Aut. de Barcelona, 08193 Bellaterra, Barcelona, Spain;2. ICREA, Instituciò Catalana de Recerca i Estudis Avançats, Barcelona, Spain;3. CERN, Theory Division, CH-1211 Geneva 23, Switzerland;4. INFN, Laboratori Nazionali di Frascati, Via E. Fermi 40, Frascati, Italy;5. INFN, Sezione di Padova, Via Marzolo 8, I-35131 Padua, Italy;6. Dipartimento di Fisica dell?Università di Pisa and INFN, Italy;g National Institute of Chemical Physics and Biophysics, Ravala 10, Tallinn, Estonia |
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Abstract: | 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 1011 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. |
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