Abstract
We demonstrate that the physics which resolves naturalness problems need not take the form of new particles and can sometimes manifest itself as higher dimensional operators. As a proof of principle, we present a simple model where the scale of new particles is parametrically separated from that estimated via naturalness arguments applied to self-quartic couplings. In this example, new particles appear far above the scale \( m/\sqrt{\lambda } \), where m is the mass of the particle and λ is its self-quartic coupling. The shift symmetry responsible for resolving the naturalness problem involves higher dimensional operators rather than new particles.
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Hook, A. Naturalness without new particles. J. High Energ. Phys. 2021, 48 (2021). https://doi.org/10.1007/JHEP04(2021)048
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DOI: https://doi.org/10.1007/JHEP04(2021)048