Two-loop dimensional reduction and effective potential without temperature expansions

Details Two-loop dimensional reduction and effective potential without temperature expansions Two-loop dimensional reduction and effective potential without temperature expansions

2000-03-13

arxiv.org/abs/hep-ph/0003111v2

Nucl.Phys. B582 (2000) 277-295

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages; small clarifications added; to appear in Nucl.Phys.B

Scientific paper

10.1016/S0550-3213(00)00298-4

In many extensions of the Standard Model, finite temperature computations are complicated by a hierarchy of zero temperature mass scales, in addition to the usual thermal mass scales. We extend the standard thermal resummations to such a situation, and discuss the 2-loop computations of the Higgs effective potential, and an effective 3d field theory for the electroweak phase transition, without carrying out high or low temperature expansions for the heavy masses. We also estimate the accuracy of the temperature expansions previously used for the MSSM electroweak phase transition in the presence of a heavy left-handed stop. We find that the low temperature limit of dealing with the left-handed stop is accurate up to surprisingly high temperatures.

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