Abstract
We evaluate dominant two-loop corrections to the triple Higgs coupling and strength of a first-order electroweak phase transition in the inert Higgs doublet model. It is found that sunset diagrams can predominantly enhance the former and reduce the latter. As a result, the triple Higgs coupling normalized by the standard model value at two-loop level is more enhanced than the corresponding one-loop value.
Highlights
Higgs mechanism is one of the fundamental footings of the standard model (SM)
Though the new scalar particle with a mass of 125 GeV was discovered at the Large Hadron Collider (LHC) [1], its roles as the mass giver for all the SM particles and the symmetry breaker for SUð2ÞL × Uð1ÞY have not been fully established yet
We find that using MICROMEGAS [27] the above parameter set gives the dark matter (DM) relic density and the spinindependent cross section of the DM with a proton as ΩDMh2 1⁄4 0.113 and σpSI 1⁄4 4.6 × 10−47 cm2, respectively, which are consistent with the current DM data [16,28]
Summary
We evaluate dominant two-loop corrections to the triple Higgs coupling and strength of a first-order electroweak phase transition in the inert Higgs doublet model. It is found that sunset diagrams can predominantly enhance the former and reduce the latter. The triple Higgs coupling normalized by the standard model value at two-loop level is more enhanced than the corresponding one-loop value
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