Branco, G.C.
Delepine, D.
Emmanuel-Costa, D.
Gonzalez, Felipe R.
(eng)
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.
Comment: LaTeX, 19 pages, 2 EPS figures, uses epsf, amsmath, amsfonts, amssymb
Bibliographic reference |
Branco, G.C. ; Delepine, D. ; Emmanuel-Costa, D. ; Gonzalez, Felipe R.. Electroweak baryogenesis in the presence of an isosinglet quark. (1998) 18 p. pages |
Permanent URL |
http://hdl.handle.net/2078/31654 |