English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Flavour effects play an important role in the statistical evolution ofparticle number densities in several particle physics phenomena. We present afully flavour-covariant formalism for transport phenomena, in order toconsistently capture all flavour effects in the system. We explicitly study thescenario of Resonant Leptogenesis (RL), and show that flavour covariancerequires one to consider generically off-diagonal number densities, rank-4 ratetensors in flavour space, and non-trivial generalization of the discretesymmetries C, P and T. The flavour-covariant transport equations, obtained inour semi-classical framework, describe the effects of three relevant physicalphenomena: coherent heavy-neutrino oscillations, quantum decoherence in thecharged-lepton sector, and resonant CP violation due to heavy-neutrino mixing.We show quantitatively that the final asymmetry is enhanced by up to an orderof magnitude, for electroweak-scale heavy neutrinos, as compared to thatobtained from flavour-diagonal or partially flavour off-diagonal equations. Afull field-theoretic treatment in the weakly-resonant regime, based on theKadanoff-Baym (KB) equations, confirms that heavy-neutrino oscillations andmixing are two distinct phenomena, and reproduces the results obtained in oursemi-classical framework. Finally, we show that the quasi-particle ansaetze,often employed in KB approaches to RL, discard the phenomenon of mixing,capturing only oscillations and leading to an underestimate of the finalasymmetry by a factor of order 2.

Flavour effects in Resonant Leptogenesis from semi-classical and Kadanoff-Baym approaches