CERN Accelerating science

Article
Report number	arXiv:2011.09347 ; CERN-TH-2020-196 ; RESCEU-22/20 ; DESY-20-202 ; TU-1112
Title	Wash-In Leptogenesis
Author(s)	Domcke, Valerie (CERN ; EPFL, Lausanne, LPPC) ; Kamada, Kohei (Tokyo U., RESCEU) ; Mukaida, Kyohei (CERN ; DESY) ; Schmitz, Kai (CERN) ; Yamada, Masaki (Tohoku U., IIAIR ; Tohoku U.)
Publication	2021-05-21
Imprint	2020-11-18
Number of pages	7
Note	5 pages + references and appendix, 1 figure, 2 tables. v2: matches version published in PRL
In:	Phys. Rev. Lett. 126 (2021) 201802
DOI	10.1103/PhysRevLett.126.201802 (publication)
Subject category	hep-th ; Particle Physics - Theory ; astro-ph.CO ; Astrophysics and Astronomy ; hep-ph ; Particle Physics - Phenomenology
Abstract	We present a leptogenesis mechanism based on the standard type-I seesaw model that successfully operates at right-handed-neutrino masses as low as a few 100 TeV. This mechanism, which we dub "wash-in leptogenesis", does not require any CP violation in the neutrino sector and can be implemented even in the regime of strong wash-out. The key idea behind wash-in leptogenesis is to generalize standard freeze-out leptogenesis to a nonminimal cosmological background in which the chemical potentials of all particles not in chemical equilibrium at the temperature of leptogenesis are allowed to take arbitrary values. This sets the stage for building a plethora of new baryogenesis models where chemical potentials generated at high temperatures are reprocessed to generate a nonvanishing B-L asymmetry at low temperatures. As concrete examples, we discuss wash-in leptogenesis after axion inflation and in the context of grand unification.
Copyright/License	preprint: (License: CC-BY-4.0) publication: © 2021-2025 authors (License: CC-BY-4.0), sponsored by SCOAP³

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