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Title: Leptogenesis from low energy CP violation

Abstract

We revisit the possibility of producing the observed baryon asymmetry of the Universe via thermal leptogenesis, where CP violation comes exclusively from the low-energy phases of the neutrino mixing matrix. We demonstrate the viability of thermal flavoured leptogenesis across seven orders of magnitude (10$$^{6}$$< T (GeV) < 10$$^{13}$$), using modern numerical machinery, where the lower bound can be reached only if flavour effects are taken into account and its value depends on the allowed degree of cancellation between the tree-level and radiative contributions to the light neutrino masses. At very high scales (T >>10$$^{12}$$ GeV), we clarify that thermal leptogenesis is sensitive to the low-energy phases, in contradiction with what is usually claimed in the literature. In particular we demonstrate that Majorana-phase leptogenesis is in general viable while Dirac-phase leptogenesis requires some level of fine-tuning.

Authors:
ORCiD logo [1];  [1];  [2];  [3]
  1. Durham Univ. (United Kingdom)
  2. Univ. of Tokyo (Japan); Istituto Nazionale di Fisica Nucleare (INFN), Trieste (Italy)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1484471
Report Number(s):
arXiv:1809.08251; IPPP/18/79; SISSA 38/2018/FISI; IPMU18-0151; FERMILAB-PUB-18-382-T
Journal ID: ISSN 1029-8479; 1695224
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Volume: 2019; Journal Issue: 3; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Moffat, K., Pascoli, S., Petcov, S. T., and Turner, J. Leptogenesis from low energy CP violation. United States: N. p., 2019. Web. doi:10.1007/JHEP03(2019)034.
Moffat, K., Pascoli, S., Petcov, S. T., & Turner, J. Leptogenesis from low energy CP violation. United States. doi:10.1007/JHEP03(2019)034.
Moffat, K., Pascoli, S., Petcov, S. T., and Turner, J. Wed . "Leptogenesis from low energy CP violation". United States. doi:10.1007/JHEP03(2019)034. https://www.osti.gov/servlets/purl/1484471.
@article{osti_1484471,
title = {Leptogenesis from low energy CP violation},
author = {Moffat, K. and Pascoli, S. and Petcov, S. T. and Turner, J.},
abstractNote = {We revisit the possibility of producing the observed baryon asymmetry of the Universe via thermal leptogenesis, where CP violation comes exclusively from the low-energy phases of the neutrino mixing matrix. We demonstrate the viability of thermal flavoured leptogenesis across seven orders of magnitude (10$^{6}$< T (GeV) < 10$^{13}$), using modern numerical machinery, where the lower bound can be reached only if flavour effects are taken into account and its value depends on the allowed degree of cancellation between the tree-level and radiative contributions to the light neutrino masses. At very high scales (T >>10$^{12}$ GeV), we clarify that thermal leptogenesis is sensitive to the low-energy phases, in contradiction with what is usually claimed in the literature. In particular we demonstrate that Majorana-phase leptogenesis is in general viable while Dirac-phase leptogenesis requires some level of fine-tuning.},
doi = {10.1007/JHEP03(2019)034},
journal = {Journal of High Energy Physics (Online)},
issn = {1029-8479},
number = 3,
volume = 2019,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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