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Three-flavored nonresonant leptogenesis at intermediate scales.

Moffat, K. and Pascoli, S. and Petcov, S. T. and Schulz, H. and Turner, J. (2018) 'Three-flavored nonresonant leptogenesis at intermediate scales.', Physical review D., 98 (1). 015036.

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.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1103/PhysRevD.98.015036
Publisher statement:Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Date accepted:07 May 2018
Date deposited:01 August 2018
Date of first online publication:27 July 2018
Date first made open access:01 August 2018

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