Abstract
We present a novel mechanism for realistic electroweak symmetry breaking in Twin Higgs/neutral naturalness models where the Z2 exchange symmetry can remain exactly unbroken. The exchange symmetry in the Yukawa sector will be implemented as an “N-trigonometric parity” \( \sin N\frac{h}{f}\leftrightarrow \cos N\frac{h}{f} \). The Yukawa couplings will be suppressed leading to an N-suppressed Higgs quadratic term, without significantly affecting the quartic. We present a concrete implementation of this idea for general (odd) values of N using maximal symmetry, and a realistic benchmark model for N = 3. We find that the tuning in the resulting Higgs potential is negligible, and also show that two-loop N-suppression violating gauge contributions can be sufficiently small. The Higgs potential and its couplings in top sector are different from other neutral naturalness models, which are the main predictions of our model and can be tested in colliders.
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Csáki, C., Guan, CS., Ma, T. et al. Twin Higgs with exact Z2. J. High Energ. Phys. 2020, 5 (2020). https://doi.org/10.1007/JHEP12(2020)005
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DOI: https://doi.org/10.1007/JHEP12(2020)005