# Naturalness without new particles

## TL;DR

This paper shows that naturalness problems can be addressed without introducing new particles, instead using higher dimensional operators, as demonstrated in a simple model with a shifted scale.

## Contribution

It introduces a model where naturalness is resolved through higher dimensional operators, not new particles, with a separation of scales.

## Key findings

- New particles can appear far above the naturalness scale
- Higher dimensional operators can resolve naturalness problems
- The model demonstrates a shift symmetry involving operators rather than particles

## 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 $\lambda$ is its self-quartic coupling. The shift symmetry responsible for resolving the naturalness problem involves higher dimensional operators rather than new particles.