Leptogenesis in automatic Nelson-Barr models
Creators
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1.
European Organization for Nuclear Research
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2.
California Institute of Technology
Abstract
In this study, we numerically show that automatic Nelson-Barr models with new chiral fermions can simultaneously solve the strong CP problem and generate the observed baryon asymmetry via high-scale leptogenesis. In these models, all CP violation arises from a single spontaneous symmetry-breaking scale, linking the origin of quark and lepton CP phases. Using conservative assumptions and minimal dynamics, we identify a viable parameter window where successful leptogenesis occurs without spoiling the quality of the strong CP solution. Models with vector-like fermions face tension within this leptogenesis scenario. A key prediction is a correlation between the baryon asymmetry and the induced QCD vacuum angle shift. Remarkably, we find that the majority of the available parameter space is within reach of current and future nucleon EDM experiments.
Copyright and License
© The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3.
Acknowledgement
We thank Pavel Fileviez Pérez and Mark Wise for numerous discussions on Nelson-Barr models. We also thank Federico Cima, Jim Cline, Miguel Escudero, Michele Papucci, Ryan Plestid, and Riccardo Rattazzi. S.P. thanks the TH department at CERN for its hospitality during the completion of this work. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Number DE-SC0011632.
Funding
This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of High Energy Physics, under Award Number DE-SC0011632.
Files
JHEP09(2025)113.pdf
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Additional details
Related works
- Is new version of
- Discussion Paper: arXiv:2506.18963 (arXiv)
Funding
- United States Department of Energy
- DE-SC0011632
- SCOAP3
Dates
- Accepted
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2025-08-13
- Available
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2025-09-16Published online