Three-flavored nonresonant leptogenesis at intermediate scales

Moffat, K.; Pascoli, S.; Petcov, S. T.; Schulz, H.; Turner, J.

doi:10.1103/physrevd.98.015036

Three-flavored nonresonant leptogenesis at intermediate scales

Moffat, K.; Pascoli, S.; Petcov, S. T.; Schulz, H.; Turner, J.

Authors

K. Moffat

Professor Silvia Pascoli silvia.pascoli@durham.ac.uk
Visiting Professor

S. T. Petcov

H. Schulz

J. Turner

Abstract

Leptogenesis can successfully explain the matter-antimatter asymmetry via out-of-equilibrium decays of heavy Majorana neutrinos in the early Universe. In this article, we focus on nonresonant thermal leptogenesis and the possibility of lowering its scale. In order to do so, we calculate the lepton asymmetry produced from the decays of one and two heavy Majorana neutrinos using three-flavored density matrix equations in an exhaustive exploration of the model parameter space. We find regions of the parameter space where thermal leptogenesis is viable at intermediate scales, T ∼ 10 6 GeV . However, the viability of thermal leptogenesis at such scales requires a certain degree of cancellation between the tree- and one-loop level contribution to the light neutrino mass matrix, and we quantify such fine-tuning.

Citation

Moffat, K., Pascoli, S., Petcov, S., Schulz, H., & Turner, J. (2018). Three-flavored nonresonant leptogenesis at intermediate scales. Physical Review D, 98(1), Article 015036. https://doi.org/10.1103/physrevd.98.015036

Journal Article Type	Article
Acceptance Date	May 7, 2018
Online Publication Date	Jul 27, 2018
Publication Date	Jul 27, 2018
Deposit Date	Aug 1, 2018
Publicly Available Date	Aug 1, 2018
Journal	Physical Review D
Print ISSN	2470-0010
Electronic ISSN	2470-0029
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	98
Issue	1
Article Number	015036
DOI	https://doi.org/10.1103/physrevd.98.015036

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