Three-flavored nonresonant leptogenesis at intermediate scales

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

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
• Public URL: https://durham-repository.worktribe.com/output/1324916