Work

Dynamics of two-Higgs-doublet CP violation and baryogenesis at the electroweak phase transition

Year: 1996

Type: article

Abstract: We quantitatively study the charge transport mechanism of electroweak baryogenesis in a realistic two-Higgs-doublet model, comparing the contributions from quarks and leptons reflecting from electroweak do-main walls, and comparing the exact profile of the $\mathrm{CP}$-violating phase with a commonly used ansatz. We note that the phenomenon of spontaneous $\mathrm{CP}$ violation at high temperature can occur in this model, even when there is no $\mathrm{CP}$ violation at zero temperature. We include all known effects which are likely to influence the baryon production rate, including strong sphalerons, the nontrivial dispersion relations of the quasiparticles in the plasma, and Debye screening of gauged charges. We confirm the claim of Joyce, Prokopec, and Turok that the reflection of $\ensuremath{\tau}$ leptons from the wall gives the dominant effect. We conclude that this mechanism is at best marginally capable of producing the observed baryon asymmetry of the universe, and we discuss some ways in which it might be enhanced.

Source: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

DOI: 10.1103/physrevd.54.2451

Authors: James M. Cline, Kimmo Kainulainen, Axel P. Vischer

Institutions: McGill University, European Organization for Nuclear Research, University of Minnesota

Language: English

Topic: Particle physics theoretical and experimental studies

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funder: U.S. Department of Energy

Awards: G222768804, RESEARCH IN THEORETICAL NUCLEAR PHYSICS, RESEARCH IN THEORETICAL NUCLEAR PHYSICS, G969889393