Conveners
Leptogenesis
- Sacha Davidson (Universite Claude Bernard-Lyon I (FR))
Leptogenesis: and Baryogenesis
- Sacha Davidson (Universite Claude Bernard-Lyon I (FR))
Luca Marzola
(U)
28/05/2014, 14:30
Cosmology and Astroparticles
Parallel Session talk
Leptogenesis is an elegant scenario that explains the neutrino mass origin and the baryon asymmetry of the Universe as natural consequences of the famous seesaw mechanism.
After introducing the attractive framework provided by the SO(10)-inspired model of Leptogenesis, I show a full set of testable predictions that pin down the same parameters that neutrino experiments are currently trying...
Daniele Teresi
(U)
28/05/2014, 14:50
Cosmology and Astroparticles
Parallel Session talk
Flavour effects play an important role in the statistical evolution of particle number densities in several particle and astroparticle physics phenomena. A *fully* flavour-covariant formulation of transport phenomena is presented, with a Resonant Leptogenesis (RL) scenario in mind, in order to capture all flavour effects, both in the heavy-neutrino and charged-lepton sectors. For concreteness,...
Dr
Alexander Kartavtsev
(Max-Planck-Institute for Physics)
28/05/2014, 15:10
Cosmology and Astroparticles
Parallel Session talk
We study runaway and crossing regimes of resonant leptogenesis, which have not been addressed before, using non-equilibrium quantum field theory. In the runaway regime the mass difference monotonously grows with temperature, whereas in the crossing regime the mass difference initially decreases, such that the effective masses become equal at some temperature. We analytically demonstrate that...
Benoit Schmauch
(I)
28/05/2014, 15:30
Flavor Physics and Neutrinos
Parallel Session talk
I present a generic approach of leptogenesis through the decay of a scalar triplet that also contributes to nonzero neutrino masses through the type II seesaw. It is known that a single scalar triplet is insufficient to generate the baryon asymmetry of the universe, so that other particles are needed. Assuming that these supplementary particles are heavy enough, their effect can be encoded in...
Ivo de Medeiros Varzielas
(University of Basel)
28/05/2014, 15:50
Flavor Physics and Neutrinos
Parallel Session talk
It is useful to write the neutrino mass matrix in terms of the eigenvectors of the lepton mixing matrix. In terms of this decomposition, the neutrino mass matrix can be seen as originating from a tribimaximal dominant structure with small departures required by the reactor mixing angle. Such a structure arises very naturally in cases with more than one mechanism responsible for neutrino masses...
Avelino Vicente Montesinos
(Université de Liège)
28/05/2014, 16:40
Cosmology and Astroparticles
Parallel Session talk
In standard type-I leptogenesis, the right-handed neutrino scattering processes are in general subleading. In contrast, in scenarios where the right-handed neutrinos couple to an extended scalar sector, their scattering processes with the new degrees of freedom can play a crucial role in the resulting B-L asymmetry. We study these scattering processes in a fairly model-independent way and show...
Gunnar Ro
(Durham University)
28/05/2014, 17:00
Cosmology and Astroparticles
Parallel Session talk
The Standard Model with an added Higgs portal interaction and no explicit mass terms is a classically scale invariant theory without the Standard Model naturalness problem. We show that we can generate the observed baryon asymmetry of the Universe in such models through Leptogenesis via the oscillation of right-handed neutrinos when the Standard Model is extended by a $U(1)_{B-L}$ gauge group....
Mr
Iason Baldes
(University of Melbourne)
28/05/2014, 17:20
Cosmology and Astroparticles
Parallel Session talk
Common mechanisms invoked to explain particle antiparticle asymmetries involve the out-of-equilibrium and CP violating decay of a heavy particle. In this talk I discuss how asymmetries can arise purely from $2 \leftrightarrow 2$ annihilations instead of the usual $1 \leftrightarrow 2$ decays and inverse decays. I will present a simple toy model to point out the salient features of such a...
Giorgio Arcadi
28/05/2014, 17:40
Cosmology and Astroparticles
Parallel Session talk
We present a mechanism able to relate the Dark Matter and Baryon densities in the context of out-of-equilibrium baryogenesis with DM production *"à la"* SuperWIMP, starting from the same initial particle.
Although rather general this mechanism is particularly well realized in the case of Gravitino Dark Matter. We will then discuss concrete realizations of this scenario in Supersymmetric...
