Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-02-25
Phys.Rev.Lett.85:5519-5522,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 figures; numerical error corrected, which implies that large CP violation is needed to get observed baryon asymmetr
Scientific paper
10.1103/PhysRevLett.85.5519
One of the most experimentally testable explanations for the origin of the baryon asymmetry of the universe is that it was created during the electroweak phase transition, in the minimal supersymmetric standard model. Previous efforts have focused on the current for the difference of the two Higgsino fields, $H_1-H_2$, as the source of biasing sphalerons to create the baryon asymmetry. We point out that the current for the orthogonal linear combination, $H_1+H_2$, is larger by several orders of magnitude. Although this increases the efficiency of electroweak baryogenesis, we nevertheless find that large CP-violating angles $\ge 0.15$ are required to get a large enough baryon asymmetry.
Cline James M.
Kainulainen Kimmo
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