THESIS
2014
x, 43 pages : illustrations (some color) ; 30 cm
Abstract
Baryogenesis has been a candidate mechanism to explain the observed matter-antimatter
asymmetry in the Universe ever since Sakharov conditions were proposed
in 1967. In order to implement this mechanism, a sizable CP-violating
source is needed, which is known to be absent in the Standard Model (SM).
Therefore, physics beyond the SM is required to solve this cosmic puzzle. In
the context of electroweak baryogenesis (EWBG),
flavor-diagonal CP phases are
often considered to be such a source, which, however, have been strongly constrained
by the null results in Electric Dipole Moment (EDM) measurements.
In this work, we propose a new possibility where the EWBG is driven by
flavor off-diagonal CP phases. The contribution of such a CP phase to EDM is generically
suppressed. There...[
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Baryogenesis has been a candidate mechanism to explain the observed matter-antimatter
asymmetry in the Universe ever since Sakharov conditions were proposed
in 1967. In order to implement this mechanism, a sizable CP-violating
source is needed, which is known to be absent in the Standard Model (SM).
Therefore, physics beyond the SM is required to solve this cosmic puzzle. In
the context of electroweak baryogenesis (EWBG),
flavor-diagonal CP phases are
often considered to be such a source, which, however, have been strongly constrained
by the null results in Electric Dipole Moment (EDM) measurements.
In this work, we propose a new possibility where the EWBG is driven by
flavor off-diagonal CP phases. The contribution of such a CP phase to EDM is generically
suppressed. Therefore, its magnitude is much less constrained by EDM
measurements. As an illustration, we work in the Two Higgs Doublet Model
(Type III) and show how
flavor off-diagonal CP phases drive the generation of
the cosmic baryon asymmetry. Given that searching for
flavor off-diagonal CP
phases is one of the top-priorities of B physics experiments like LHCb, this study
provides a strong theoretical motivation for such measurements.
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