Conveners
P6 – DM MODELS & LEPTOGENESIS
- Michele Frigerio (IFAE, UAB, Barcelona)
Lorenzo Calibbi
(MPP, Munich)
31/05/2011, 16:30
We investigate the constraints to the light neutralino dark matter scenario in the minimal supersymmetric standard model from available experimental observations such as decays of B and K meson, relic dark matter abundance, and the search for neutralino and Higgs production at colliders. We find that two regions of the MSSM parameter space fulfill all the constraints: a fine-tuned strip with...
Prof.
Sudhir Vempati
(Indian Institute of Science, Bangalore)
31/05/2011, 16:45
In minimal supergravity (mSUGRA) or CMSSM, one of the main co-annihilating partners of the neutralino is the right handed stau, $\tilde{\tau}_R$. In the presence of flavor violation in the right handed sector, the co-annihilating partner would be a flavor mixed state. The flavor effect is two fold: (a) It changes the mass of the $\tilde{\tau}_{1}$, thus modifying the parameter space of the...
Dr
Adisorn Adulpravitchai
(Max Planck Institute for Nuclear Physics)
31/05/2011, 17:00
We consider the minimal model in which dark matter is stabilized by a non-Abelian discrete symmetry. The symmetry group is taken to be D3, which is the smallest non-Abelian finite group. The minimal model contains (nontrivial) singlet and doublet scalar representations of D3 which couple to the Standard Model fields via the Higgs portal. This construction predicts two species of dark matter...
Dr
Mariam Tórtola
(IFIC, Valencia)
31/05/2011, 17:15
We propose an $A_4$ flavor-symmetric seesaw model where lepton number is broken spontaneously. A consistent two-zero texture pattern of neutrino masses and mixing emerges from the interplay of type-I and type-II seesaw contributions, with important phenomenological predictions. We show that, if the Majoron becomes massive, such seesaw scenario provides a viable candidate for decaying dark...
Dr
Stefano Morisi
(IFIC/CSIC)
31/05/2011, 17:30
There are several extension of the standard model predicting good dark matter candidates like in supersymmetry. However, it turns out that in most models the stability of the dark matter is assumed by hand, typically assuming a parity symmetry. Of course any of these models may be correct, but certainly it would be desirable to provide a fundamental explanation of the origin of the stability...
Dr
Francois-Xavier Josse-Michaux
(IST, CFTP)
31/05/2011, 17:45
Dr
enrico bertuzzo
(Scuola Normale Superiore)
31/05/2011, 18:00
We discuss the conditions to realize a scenario of ‘strong thermal leptogenesis’,
where the final asymmetry is fully independent of the initial conditions, taking into
account both heavy and light neutrino flavor effects. In particular, the contribution
to the final asymmetry from an initial pre-existing asymmetry has to be negligible.
We show that in the case of a hierarchical right-handed...
Dr
Andreas Hohenegger
(Max-Planck-Institut für Kernphysik)
31/05/2011, 18:15
The standard models of particle physics and cosmology imply the absence of a sizable matter-antimatter asymmetry in the very early universe. Its existence, essential for the subsequent evolution of the universe, represents a major puzzle of present-day physics. Leptogenesis addresses this issue in an elegant way and can be realized in many standard model extensions. In this scenario a quantum...
