Other
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may..a202h&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #A2.02
Other
Scientific paper
The matter-antimatter asymmetry is one of the most puzzling global properties of today's universe. A mechanism of production unambiguously requires that a violent phenomenon took place at an early epoch of the universe during which both baryon violating and CP violating processes were active. The realization of these conditions is strongly constrained by the structure of the symmetry breaking sector and the CP violating content of the standard model of particle physics. In this presentation, we focus our attention on the constraints from CP violation. It is argued that: (a) If the standard model had all its CP violation originating from the Cabibbo-Kobayashi-Maskawa matrix, then the existence of a baryogenesis mechanism is prohibited by the fast and incoherent quark-gluon interactions. (b) If the standard model had other sources of CP violation, then the constraints are generically relaxed and the requirement of a successful baryogenesis becomes a numerical question which is parameter dependent. (c) In the particular situation of a class of supersymmetric models in which CP violation arises from soft supersymmetry breaking operators, the magnitude of the CP violating phases required is compatible with quoted upper bounds obtained from electric dipole moment measurements provided that some of the charginos or neutralinos have a mass in a range which does not extend far beyond the reach of LEP II.
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