1992/12/10 by Peter Arnold, Olivier Espinosa · 2 citations
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1103/physrevd.47.3546
published as Phys.Rev.D47:3546,1993; Erratum-ibid.D50:6662,1994; Phys.Rev.D50:6662,1994 · 64 pages, Revised Version, Uw/PT-92-18. REVISION: fig. 7 and the paragraph describing it have been eliminated since the claim of IR divergence for fig. 7 was insane. None of the rest of the paper is affected
arxiv created 1992/12/10 · arxiv updated 2014/11/17
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 g4 ≪ λ≪ g2, where λ is the Higgs self-coupling and g is the electroweak coupling. The limit λ≪ g2 ensures that the phase transition is significantly first-order, and the limit g4 ≪ λ 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.