Accidental matter at the LHC

TL;DR

This paper classifies weak-scale extensions of the Standard Model that preserve its symmetry structure, remain invisible to low-energy probes, and predict new stable charged or colored particles detectable at colliders.

Contribution

It provides a comprehensive classification of Standard Model extensions that maintain accidental symmetries and are consistent up to very high energies, identifying potential collider signatures.

Findings

Finite set of viable models identified

Predicts new charged/colored stable particles

Models consistent with cosmological constraints

Abstract

We classify weak-scale extensions of the Standard Model which automatically preserve its accidental and approximate symmetry structure at the renormalizable level and which are hence invisible to low-energy indirect probes. By requiring the consistency of the effective field theory up to scales of 10^15 GeV and after applying cosmological constraints, we arrive at a finite set of possibilities that we analyze in detail. One of the most striking signatures of this framework is the presence of new charged and/or colored states which can be efficiently produced in high-energy particle colliders and which are stable on the scale of detectors.