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SPECIAL ISSUE: Leptogenesis — Current Challenges for Model Building, Phenomenology and Non-Equilibrium Field Theory; Guest Editors: B. Garbrecht and E. MolinaroNo Access

Flavor effects in leptogenesis

Department of Physics and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130, USA

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Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK

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Physik Department T70, Technische Universität München, James-Franck-Straße, 85748 Garching, Germany

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Institut de Physique Théorique, Université Paris Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France

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School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK

E-mail Address: p.millington@nottingham.ac.uk

Corresponding author.

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Service de Physique Théorique, Université Libre de Bruxelles, Boulevard du Triomphe, CP225, 1050 Brussels, Belgium

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https://doi.org/10.1142/S0217751X18420010Cited by:73 (Source: Crossref)

Abstract

Flavor effects can have a significant impact on the final estimate of the lepton (and therefore baryon) asymmetry in scenarios of leptogenesis. It is therefore necessary to account fully for this flavor dynamics in the relevant transport equations that describe the production (and washout) of the asymmetry. Doing so can both open up and restrict viable regions of parameter space relative to the predictions of more approximate calculations. In this paper, we identify the regimes in which flavor effects can be relevant and illustrate their impact in a number of phenomenological models. These include type I and type II seesaw embeddings, and low-scale resonant scenarios. In addition, we provide an overview of the semi-classical and field-theoretic methods that have been developed to capture flavor effects in a consistent way.

Keywords:

PACS: 11.10.Wx, 11.30.Fs, 14.60.-z

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