21-26 July 2014
Renold Building
Europe/London timezone
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Flavour Covariant Transport Equations for Resonant Leptogenesis

Presented by Mr. Daniele TERESI on 21 Jul 2014 from 16:50 to 17:10
Type: Particle Cosmology
Track: Particle Cosmology


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, we consider the Standard Model accompanied by quasi-degenerate heavy Majorana neutrinos, even though the formalism can be easily applied to study flavour effects in other physical situations. Flavour covariance requires one to consider generically off-diagonal number densities, as well as rank-4 rate tensors in flavour space. Particular emphasis is put on the non-trivial generalization of the discrete symmetries C, P and T in the flavour-covariant formalism. The flavour-covariant transport equations provide an unified description of RL, capturing three relevant phenomena: coherent heavy-neutrino oscillations, quantum decoherence in the charged-lepton sector, and the standard resonant CP violation due to heavy-neutrino mixing. We show quantitatively, in a minimal electroweak-scale RL model, that the final asymmetry predicted by the flavour-covariant rate equations is enhanced of even an order of magnitude, as compared to that obtained from flavour-diagonal or partially flavour off-diagonal equations.


Location: Renold
Room: F14

Primary authors