Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-06-22
Phys.Rev.D50:7703-7714,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, 4 figures available upon request, DFPD 94/TH/38 and SISSA 94/81-A preprints
Scientific paper
10.1103/PhysRevD.50.7703
We study the spontaneous CP breaking at finite temperature in the Higgs sector in the Minimal Supersymmetric Standard Model with a gauge singlet. We consider the contribution of the standard model particles and that of stops, charginos, neutralinos, charged and neutral Higgs boson to the one-loop effective potential. Plasma effects for all bosons are also included. Assuming CP conservation at zero temperature, so that experimental constraints coming from, {\it e.g.}, the electric dipole moment of the neutron are avoided, and the electroweak phase transition to be of the first order and proceeding via bubble nucleation, we show that spontaneous CP breaking cannot occur inside the bubble mainly due to large effects coming from the Higgs sector. However, spontaneous CP breaking can be present in the region of interest for the generation of the baryon asymmetry, namely inside the bubble wall. The important presence of very tiny explicit CP violating phases is also commented.
Comelli Denis
Pietroni Massimo
Riotto Antonio
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