Sphalerons with CP-Violating Higgs Potentials

Details Sphalerons with CP-Violating Higgs Potentials Sphalerons with CP-Violating Higgs Potentials

1998-11-10

arxiv.org/abs/hep-ph/9811289v1

Phys.Rev. D59 (1999) 116014

Physics

High Energy Physics

High Energy Physics - Phenomenology

13pp LaTeX2e, 2 eps figs, uses graphicx, a4

Scientific paper

10.1103/PhysRevD.59.116014

We investigate the effect on the sphaleron in the two Higgs doublet electroweak theory of including CP violation in the Higgs potential. To have better control over the relation between the sphaleron energy and the physical quantities in the theory, we show how to parametrize the Higgs potential in terms of physical masses and mixing angles, one of which causes CP violation. By altering this CP violating angle (and keeping the other physical quantities fixed) the sphaleron energy increases by up to 10%. We also calculate the static minimum energy path between adjacent vacua as a function of Chern-Simons number, using the method of gradient flow. The only effect CP violation has on the barrier is the change in height. As a by-product of our work on parametrization of the potential, we demonstrate that CP violation in the Higgs sector favours nearly degenerate light Higgs masses.

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