https://doi.org/10.1140/epjc/s10052-025-13824-8
Regular Article - Theoretical Physics
Higgs alignment from multicritical-point principle in two Higgs doublet models
1
Department of Physics and Center for Theoretical Physics, National Taiwan University, 106, Taipei, Taiwan
2
Physics Division, National Center for Theoretical Sciences, 10617, Taipei, Taiwan
3
School of Physics, KIAS, 02455, Seoul, Korea
4
Department of Information and Mathematical Sciences, Tokyo Woman’s Christian University, 167-8585, Tokyo, Japan
5
Department of Physics, Osaka University, 560-0043, Toyonaka, Osaka, Japan
Received:
5
August
2024
Accepted:
15
January
2025
Published online:
25
January
2025
In models with non-minimal Higgs sectors, enforcing (near) Higgs alignment, necessary to prevent significant deviations in the Higgs boson coupling from the standard model prediction, causes a serious fine-tuning problem. We demonstrate that the Higgs alignment is naturally deduced from the multicritical point principle (MPP) in the general two Higgs doublet model while keeping non-zero CP-violating phases. Furthermore, we discuss the possibility of realizing the Yukawa alignment from the MPP, which is necessary to prevent flavor-changing neutral currents mediated by Higgs bosons at tree level, and find that it seems difficult to realize it by the MPP due to the non-diagonal structure of the CKM matrix.
© The Author(s) 2025
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