A high-resolution version for printing - CP3-Origins

This part of the workplan has multiple purposes: it will lead to a deeper understanding of the
Origin of Mass, both theoretically and phenomenologically; it allows us to get closer to cosmology
by direct investigation of models of Dark Matter and baryogenesis; it will lead to a better
understanding of the LHC complex phenomenology and its possible outcomes. In the long run,
and depending on the LHC outcome, we will also explore how these models may fit in a more
unified theory of all forces, including gravity. One can envision, for example, the possibility of
marrying supersymmetry and technicolor at a scale higher than the electroweak.
Flavour Physics
The goal of this project is to help uncovering an underlying and more fundamental flavour
structure of the SM. This will help guiding our intuition for constructing more solid extensions
of the SM.
Perturbed S3 neutrinos
We studied the effects of the perturbation which violates the permutation symmetry of three
Majorana neutrinos but preserves the well known (23) interchange symmetry. This is done in
the presence of an arbitrary Majorana phase which serves to insure the degeneracy of the three
neutrinos at the unperturbed level.
[Perturbed S(3) neutrinos. Renata Jora, (Barcelona, Autonoma U.) , Joseph Schechter, M. Naeem Shahid,
(Southern Denmark U., CP3-Origins & Syracuse U.). CP3-ORIGINS-2009-12, SU-4252-898,
Phys.Rev.D80:093007,2009.]
Discrete Minimal Flavour Violation
We investigated the consequences of replacing the global flavour symmetry of Minimal Flavour
Violation (MFV) SU(3)_QxSU(3)_UxSU(3)_Dx..., by a discrete D_QxD_UxD_Dx.. symmetry.
Goldstone bosons resulting from the breaking of the flavour symmetry generically lead to
bounds on new flavour structure many orders of magnitude above the TeV-scale. The absence of
Goldstone bosons for discrete symmetries constituted the primary motivation of our work. Less
symmetry implies further invariants and renders the mass flavour basis transformation observable
in principle and calls for a hierarchy in the Yukawa matrix expansion. We showed, through
the dimension of the representations, that the (discrete) symmetry in principle does allow for
additional Delta F = 2 operators.
[On discrete Minimal Flavour Violation.
Roman Zwicky, Thomas Fischbacher, (Southampton U.) Published in Phys.Rev.D80:076009,2009.]
In the future we plan to further investigate the flavour structure stemming out from technicolor
type extensions of the SM.
Matter-Antimatter Asymmetry
The matter-antimatter asymmetry, namely the violation of the discrete CP symmetry, is a phenomenon
intimately linked to the origin of fermion masses.
A better characterisation and understanding of CP violation would help in our quest to go beyond
the SM. CP is violated by weak interactions. The SM does not explain this violation, but
successfully accounts for it under the form of a phase in the quark mixing matrix.
CP³-Black book 14