The QCD Axion and Electroweak Vacuum Stability
| Autor: | McDonald, J. |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Popis: | The complex field $\Phi$ containing the QCD axion has a natural portal coupling to the Higgs doublet of the form $\lambda_{h \phi}|\Phi|^2 |H|^2$. Here we consider the possibility that $\lambda_{h \phi}$ has a natural magnitude for a dimensionless coupling, $\lambda_{h \phi} \sim 0.1-1$. This is possible if the total mass squared parameter of the Higgs in the vacuum, including quadratic divergent and the $\Phi$ vacuum expectation value contributions, is renormalized to reproduce the observed Higgs boson mass. It is then possible for the axion sector to stabilize the electroweak vacuum. We show the requirement of electroweak vacuum stability implies that the axion decay constant satisfies $f_{a} < 1.3 \times 10^{10}$ GeV. Comment: 5 pages, 3 figures. Our discussion omits the dominant tree-level shift (discussed in 1203.0237) of the Higgs quartic coupling in the full theory relative to the Higgs quartic coupling of the low-energy effective Standard Model. This shift can easily the electroweak vacuum. Therefore our conclusions (and upper bound on $f_a$) are invalid |
| Databáze: | OpenAIRE |
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