Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-12-08
Phys.Rev.D47:3546,1993; Erratum-ibid.D50:6662,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
64 pages, Revised Version, Uw/PT-92-18. REVISION: fig. 7 and the paragraph describing it have been eliminated since the claim
Scientific paper
10.1103/PhysRevD.47.3546 10.1103
Scenarios for electroweak baryogenesis require an understanding of the effective potential at finite temperature near a first-order electroweak phase transition. Working in Landau gauge, we present a calculation of the dominant two-loop corrections to the ring-improved one-loop potential in the formal limit $g^4 \ll \lambda \ll g^2$, where $\lambda$ is the Higgs self-coupling and $g$ is the electroweak coupling. The limit $\lambda \ll g^2$ ensures that the phase transition is significantly first-order, and the limit $g^4 \ll \lambda$ allows us to use high-temperature expansions. We find corrections from 20 to 40\% at Higgs masses relevant to the bound computed for baryogenesis in the Minimal Standard Model. Though our numerical results seem to still rule out Minimal Standard Model baryogenesis, this conclusion is not airtight because the loop expansion is only marginal when corrections are as big as 40\%. We also discuss why super-daisy approximations do not correctly compute these corrections.
Arnold Peter
Espinosa Olivier
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