A Chiral Nelson-Barr Relaxion
Abstract
We present the chiral Nelson-Barr relaxion model, an extension of the Nelson-Barr relaxion framework with a gauged chiral U(1) symmetry. It includes vector-like quarks to cancel gauge anomalies and a scalar whose vacuum expectation value generates their masses. The chiral symmetry forbids the leading operators responsible for the Nelson-Barr and clockwork quality problems. Right-handed neutrinos generate light-neutrino masses through the type-I seesaw mechanism and permit thermal leptogenesis. For the particular coupling considered, relaxion phenomenology gives fmaxpheno∼ 4× 1011 GeV, about eight times the corresponding phenomenological ceiling in the original model. The model can accommodate thermal leptogenesis if its right-handed-neutrino masses and reheating history satisfy the required temperature bounds.
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BibTeX
@misc{arzate2026chiral,
title = {{A Chiral Nelson-Barr Relaxion}},
author = {Cristien Arzate and Joshua Iascau},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.30773},
eprint = {2610.30773},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.30773},
}
RIS
TY - UNPB
TI - A Chiral Nelson-Barr Relaxion
AU - Cristien Arzate
AU - Joshua Iascau
PY - 2026
DA - 2026/10/23
PB - arXiv
DO - 10.48550/arxiv.2610.30773
UR - https://arxiv.org/abs/2610.30773
AB - We present the chiral Nelson-Barr relaxion model, an extension of the Nelson-Barr relaxion framework with a gauged chiral U(1) symmetry. It includes vector-like quarks to cancel gauge anomalies and a scalar whose vacuum expectation value generates their masses. The chiral symmetry forbids the leading operators responsible for the Nelson-Barr and clockwork quality problems. Right-handed neutrinos generate light-neutrino masses through the type-I seesaw mechanism and permit thermal leptogenesis. For the particular coupling considered, relaxion phenomenology gives f_max^pheno∼ 4× 10^11 GeV, about eight times the corresponding phenomenological ceiling in the original model. The model can accommodate thermal leptogenesis if its right-handed-neutrino masses and reheating history satisfy the required temperature bounds.
ER -