Vacuum Stability in the Standard Model and Beyond
arxiv(2024)
摘要
We revisit the stability of the Standard Model vacuum, and investigate its
quantum effective potential using the highest available orders in perturbation
theory and the most accurate determination of input parameters to date. We
observe that the stability of the electroweak vacuum centrally depends on the
values of the top mass and the strong coupling constant. We estimate that
reducing their uncertainties by a factor of two is sufficient to establish or
refute SM vacuum stability at the 5σ level. We further investigate
vacuum stability for a variety of singlet scalar field extensions with and
without flavor using the Higgs portal mechanism. We identify the BSM parameter
spaces for stability and find sizable room for new physics. We further study
the phenomenology of Planck-safe models at colliders, and determine the impact
on the Higgs trilinear, the Higgs-to-electroweak-boson, and the Higgs quartic
couplings, some of which can be significant. The former two can be probed at
the HL-LHC, the latter requires a future collider with sufficient energy and
precision such as the FCC-hh.
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