Electroweak Baryogenesis in the Presence of an Isosinglet Quark

Details Electroweak Baryogenesis in the Presence of an Isosinglet Quark Electroweak Baryogenesis in the Presence of an Isosinglet Quark

1998-05-12

arxiv.org/abs/hep-ph/9805302v1

Phys.Lett. B442 (1998) 229-237

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 19 pages, 2 EPS figures, uses epsf, amsmath, amsfonts, amssymb

Scientific paper

10.1016/S0370-2693(98)01253-2

We consider the possibility of electroweak baryogenesis in a simple extension of the standard model with an extra singlet complex scalar and a vector-like down quark. We show that in the present model the first-order electroweak phase transition can be strong enough to avoid the baryon asymmetry washout by sphalerons and that the CP-violating effects can be sufficient to explain the observed baryon-to-entropy ratio nB/s ~ 10^(-10). Other appealing features of the model include the generation of a CKM phase from spontaneous CP breaking at a high energy scale and a possible solution of the strong CP problem through the natural suppression of the parameter theta.

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